Think I settled on my character builds. Still been working on this since yesterday; hadn't played the game yet but I think I'm ready. Tried to format it as:
STR, MAG, VIT, SPD Stats*; Character, Jobs, Augments (Swiftness, Channeling, Adrenaline, Focus, Spellbreaker, Serenity). Then, Espers, and abbreviations for the gear. It's using every armor only 1 time to make sure that I didn't mess up and make it impossible for 2 characters using the same gear to both hit 99/99 or something like that. *I chose to put the total stat despite the 99 cap to keep track of wasted +stats or how closely I flushed everyone to the 99 cap.
099/100/47/38 - BAS - BSH/MNK - S3C0 AFSS - CHA ZOD - GldCp + Lrdly + Genji
099/068/98/98 - BAL - SHI/FOE - S3C0 AF - BEL ZAL CUC SHE ULT - GrndH + Mirag + Grmns (or Genji @ 99/68/78/48)
099/085/62/41 - FRA - KNI/TBM - S3C3 AFSS - ADR HAS - Genji + Genji + JadeA + Blood Sword A + Aegis Shield = EVA 74% + MEVA 65%
099/073/61/43 - VAA - KNI/MCN - S3C0 AF - MAT EXO FAM - DuelM + Maxim + Genji
100/103/57/36 - ASH - UHL/WHM - S2C3 AFSS - BEL - Circl + GrndA + ?????
071/115/78/36 - PEN - BLM/RDM - S2C3 SS - ZER - Hairp + GlmRb + ?????
Balthier is my main guy and he's probably my favorite build in that for both SHI Ninja Swords and Daggers or FOE Axes and Hammers, I hit 99/98/98 for STR, VIT, and SPD. He has a lot of versatility, too, with being able to use Main Gauche + Shield Block 3 to tank, buff or debuff with Protectga/Shellga (via Esper, sacrificing either 1 STR or MAG on Vaan or Fran) or all 4 Breaks, or help out with recovery since (with no ARC) he has Phoenix Lore 2 and Potion/Remedy Lores 3. But he's primarily DPS and can switch in Genji Glove for the 32 or 25 combo rates, respectively, of Orochi N or Scorpion Tail F and still be 99/48 and 99/79, respectively, or go 99/98 if Orochi N or if I just want to see the biggest numbers possible, Scorpion Tail F.
It fits my headcanon, too. Shikari can use guns so Balthier could just as easily be it as a Machinist. Let's me also go all-ranged for Fun with Balthier, Fran, Vaan, or Balthier, Vaan, Penelo if I want to do Oil + fire attacks. Balthier is inferior with guns, but my headcanon is, he uses guns as a ruse to help hide his past job, and that in his past job he was a Foebreaker.
Basch as a Bushi was a hard decision. A lot of people are going Bushi + Knight or even + Foebreaker or Shikari. I ruled out Shikari because I felt it kept him from perfecting his DPS and lacked taking advantage of his MAG. Likewise for FOE, for MAG. So, that leaves Bushi + Knight. However, what does Knight offer? Heavy Armor + Zodiac Esc. Shield + Shield Block 3. Higher EVA would be nice for Critical HP Berserked DPSer, but most difficult Bosses/Marks in this game have Null Evasion, so all the EVA become useless. Also, you're at 99/97 STR/MAG, whereas BSH/MNK can easily hit 99/99 with Mystic Armor.
BSH/KNI is still great. The stat difference is marginal and symbolic with Masamune I, and even if the EVA is useless, BSH/KNI will have MEVA 60 vs just MEVA 5 on BSH/MNK, but with the way Critical HP works as a percentage of max HP, the HP advantage of BSH/MNK may be more useful for keeping a <20% HP alive because BSH/MNK can wear Dueling Mask and still hit 99 STR for Masamune I, and with HP Augments will have about [with Bubble] about 3500-4000 more HP than BSH/KNI (depending on Exodus), which is then an extra 700-800 HP to work with at Critical HP. That should put Basch at 18,118 HP as BSH/MNK vs 14,648, or instead of Critical HP of <2929 he'll have <3623. I think the huge EVA advantage is a non-factor by that point because any monster than doesn't have Null Evasion won't kill you anyhow, but to be sure it's basically a +55 MEVA vs +700 HP (at <HP Critical) for keeping your Adrenaline Berserk DPSer alive.
I'd probably give BSH/KNI the edge, but my other concern is my main party is a SHI/FOE and KNI/TBM (for easier Haste + Bubble during the story), so BSH/MNK is going to better take advantage of my 99 MAG than BSH/KNI (MNK gets Curaja without Esper, Holy, Renew, and Arise too but then your MCH loses Hastega/Slowga). So, BSH/MNK gives me a better healer when I'm not Berskered, and I think the extra HP when <HP Critical is an interesting alternative to big MEVA advantage of KNI.
The other 4 characters have a lot of freedom. I went with 2 Knights partially because I think the Job can be split well into 1 DPSer with Tournesol (Vaan + Genji Glove usually about 4-8% less DPS than Basch BSH) but gets the Curaja to help out with healing and party MP, and another one into 1 Tank/Healer with Zodiac Esc. Shield. and gets Brave, Faith, Curaja, and then goes for a 2nd Job that gives you Magic Lores and Channeling. I went with KNI/MCN on Vaan so he do top DPS with Tournesol + Swiftness 3 but still has Curaja, Hastega, and Slowga; then, Fran as KNI/TBM also with Swiftness 3 but also lots of Magick Lore and Channeling 3 for Curaja, Hastes, Berserk, Bubble, etc. TBM is kinda gimpy but I think it fits KNI well and makes a strong endgame Tank/Healer/Buffer but also early game you get manageable support with Cura, Raise, Haste pretty early. Plus it fits my headcanon of Balthier, Fran, and Vaan all being able to use ranged weapons hhhh.
Fran as KNI/TBM has a lot Accessory freedom. Thinking for the story, can use Jade Collar + Blood Sword A + Aegis Shield + Decoy to be my main tank with EVA 64 and then even with Null Evasion Boss/Marks, the MEVA 65 will nice. I was thinking, I could use Genji Armor (both still hit 99 STR) + Battle Harness, too, on either Vaan or Fran if I wanted them to tank easier mobs, and I think their 84% counterattack rate would suit Tournesol and its low combo rate better than Genji Gloves if they're tanking low-medium difficulty enemies. If you're controlling them as main character and lead them into mob groups, you'll get the 1st attack and a lot of counterattacks right off the bat. I'd switch to a shield though for any difficult mob though.
Rest of the party has some freedom about switching up items and keeping important stats at 99. For example, no one is using the Magepower Shishak. Fran could use it and the extra +1 STR wouldn't matter but she would gain +1 MAG and +MDEF. Or, if Ashe wanted to use White Robes for P-Up Holy (Holy Lance or Holy spell), she could replace Circlet + Grand Armor (+14 STR, +10 MAG) for Magepower Shishak + White Robes (+11 STR, 15 MAG). She'd end up at STR/MAG 97/99 instead of 99/99 but she'd utilize the Magepower Shishak more than Fran in that scenario (assuming I was using both together).
Similarly, Vaan hits STR 99 easily so I went with Dueling Mask and Maximillion (Rather than, say, Grand Armor or Magepower Shishak) so that he exactly reaches 99 but doesn't go over, but also gains the +800 HP and +6 Speed, respectively. But if I want more MAG instead, I could switch in Magepower Shishak. Penelo I made sure could still hit 99 MAG with Flame Staff (for Ardor + Oil) and subpar gear, though she can reach MAG 99 and pretty impressive VIT 78. In practice, I'd probably give her MP and SPD though, depending on who's gear I can steal.
That's about all on my build. It's quite long, and partially wrote it I think just to double check everything. I spent probably 2 weeks trying to perfect it. I haven't even played the game yet because I wasn't ready lol. I had the day off today even and I spent all day still going back and forth on KNI vs MNK for BSH, or whether to make Balthier or Basch my FOE or BSH. And then, with my rather DPS-focused-party, how I can I get more healing and buffing? Fran was originally a MNK/KNI: I wanted Scorpion Tail, Masamune, Whale Whisker + Genji Glove x 3. Fran becoming KNI/TBM was out of a need for better MAG/Channeling and healing/buffing haha.
There's some degree of preference in there. It's probably 80/20 min-maxing/headcanon or preference. Going two KNIs and no ARC, for example. I just want Vaan with a 2H sword and Fran with a 1H sword, and I have some 'fun' party ideas like Balthier (Fomalhaut + Fire Ammo), Vaan (Alberaan Y + Fire Ammo), and Penelo (Flame Staff + Ardor + Oil) for massive damage. Or, Vaan, Balthier, and Fran all using ranged weapons and going hunting on Cerobi Steppes. I had trouble deciding on my Ulhan but I went for Ashe + Holy Lance + White Robes, and ultimately I went with FOE for Balthier and BSH for Basch mostly based on which weapon stance/animations I prefer for each -- they're pretty much equal if you exchange them (Basch a slightly better FOE <20 HP with Genji; Balthier slightly better at 100% HP with Germinas Boots). A bit of headcanon in there, too... Basch being the Samurai (he sort of is in RK) and Monk and Whale Whisker also kind of fit that, while I think a Shikari/Foebreaker fits the current story of Balthier but also his history quite well (imagine his character art actually in heavy armor with a heavy axe/hammer). And as a sky pirate, he's basically sort of my FF Tactics Ninja with either Yagyu Darkblade or Scorpion Tail.