First I've got to do my customary complaining. I think the real problem with customs isn't the options they give, but the sometimes wonky priority and effects they have. Unfortunately I doubt Jigglypuff will be able to keep up in the customs meta. Jiggs versus Ganondorf is a battle of agility, but when Ganondorf has the movement options customs give him that's gone too. And no attack Puff has has more priority than Ganondorf's. Pound (side-b) would normally supersede Gdorf's side-b and clash with the down-b (might have to double-check the latter).
Hitting me 1/4 into battlefield with Ganandorf's up-b? Side-b that carries you through me so far that it's not punishable. Down-b canceling? I'm most salty about his dair though, goddamnit it sucks. It's so easy too, it's not even "hype" to get hit by it cause the attack is so huge, hitting from his waist down. And poor Bowser (and anyone with a mostly horizontal recovery) really doesn't have much to answer it.
Yeah I'm actually more interested in dash slam, or whatever that side b custom is called, as far as Bowser customs go. I'll have to spend some time with it, since I just unlocked it the other day (I erroneously said I'd unlocked everything for Bowser a bit back, turns out I was wrong). The fire projectile did better than I expected, if you didn't have your down-b custom I would have gotten more use out of it. I can see it being useful in certain matchups (Sonic, specifically). Dash slash looks cool and feels good to use but I dislike that it doesn't take me anywhere if I still have backwards momentum - that really sours it for me. Plus all of your attacks have more priority.
As for 'Dorf, I think you know him a lot better than I do. I think in the Bowser matchup you've got most things figured out. I was able to punish your rolls sometimes, I guess. There were some questionable neutral b's on your part, but you already know that. I imagine that you'd have a whole other set of problems against the high tier characters, but you'll have to figure out those yourself.
Some really weird moments in those matches. Pretty sure we had an air clash at some point. Weird momentum-related things too. I think the physics in this game could use a recheck by Treehouse or whoever, especially as customs can really be unpredictable.
Damn man, I have never seen you so salty.
Jigglypuff has NEVER been about having more priority than your opponent. Otherwise Jiggs would be irrelevant in the Melee meta thanks to all the Marth players. Jiggs uses her mobility to bait attacks, move in, and then punish. You are misunderstanding the character. A few times you did this, but you were also often happy to charge in and get booted.
Dorf's side B has a lot of windup. It only works as a punishment move reliably. Every time you went to land with Jiggs, I hit you with it because landing is not safe. You should have baited the side B by pretending to land, floating away, and then hitting me during the move's massive recovery.
I totally agree that the up B hits were hilariously unexpected. That said, there is a dark cloud around his fists that tells you where the hitbox is, and Dorf isn't the only character that can hit from below the stage.
Dorf down B makes him into a viable character. It destroys zoning so he can get in. The default down B can KO at reasonable %, though, and the custom can't. It is the same tradeoff Bowser gets from Dash Klaw. Mobility and flexibility for giving up a situational kill move.
Man, if you think Dorf's Dair is bonkers, play Direct_Quote's Lucina. I actually changed Dorf's moveset just to counter it. I was getting spiked all day long. Yeah, it sucks to get spiked, but that is Dorf. He is the ultimate early killer. Bowser sucks off the ledge, it is part of his balance. Now, if you want, you could use Bowser's recovery customs to be safe from spikes. But I doubt you want to do that, because Fortress is so good. Then again, you don't like Fortressing much, so maybe you would like it.
Dash Slam is mega ass. So is Bowser's fireball. Sonic can counter it easy with homing dash attack. You got hit out of Dash Slash because your spacing was poor. Plus you were spamming it, so it became predictable. I understand spamming a new move to figure it out, but don't blame the move for that.
This is day 3 of learning Dorf, so I am still learning a lot. I read a lot of guides and watched videos last night. I actually think Bowser still wins the matchup, even with Dorf customs. Shield punishing is really good. I think you just get too offensive for your own good. Also, Dair is great, but if it can be punished by a move that will kill you, I recommend against it. You lost a few stocks that way.
I must say, your post, and all its salt, makes me feel pretty good.
I can't edit the spread...
An editing link should have been emailed to you.