I did something similar with Luneth (BSB, SSB), Zidaine (BSB - imperil), Vaan (BSB), Arc (SSBs),Ramza (Shout+Chant)OK (I did the Cid missions also BSB and OSB, OSB was like 48k damage). A mug bloodlust was somewhere as well. I'm guessing your Faris USB is USB2 with the imperil. You're going to need imperil.
What I found is I had to do with Luneth the following actions Dark Bargain, BSB, CMD2*, Cloud USB, SSB, SSB and for some dumb reason decided to use the other Cloud USB on Zidaine (Vaan would be far better, instant cast).
*-To buy time for the imperils to happen (no idea how much overkill the boosts are), if they don't have at least two up I ran out of SBs before doing enough
I suppose Sky High is another thing you stick on Luneth in case BSB entry of x6.24 vs SSB entry of x7.76 makes much difference.
Thanks for the advice. I've never done a Cloud USB strat before because I lack native Wall and usually RW that, but here it looks viable, plus Faris's USB2 is a reverse wall with a mind break for that stupid Curaga. I have Vaan legend dived with Mug Bloodlust so I can sub out Ramza for him and give it a shot.
Luneth - Dark Bargain, BSB, CMD2, RW Cloud, BSB, BSB, CMD1
Vaan - Mug BL, RW Cloud, BSB, BSB, BSB, commands/thief's revenge
Faris - USB, USB, USB, other breaks
OK - BSB, Full Break/Armor Breakdown/CMD1