Aww, bip. But a GOE never fails. A GOE GOES!

Anyways, the key to the Jecht fight is speed increasing items/spells, and the ever useful Zombie Attack. Not only does this prevent BFA's overdrive charge, but he will not heal when the Yu Pagodas get a turn (the first will damage, but it dispels Zombie). No need to disable the Yu Pagodas if all they do is get in BFA's way. The only spells you really need are Protect and Haste (and maybe Quick Hit if you have it). You waste turns setting up Shell or using other skills.

Don't forget to save Tidus' "Talk" option for when the bars are almost full; this depletes the Overdrive AND makes BFA lose a turn up to two times. The thing to do with this battle is to keep the party as Tidus/Auron/Yuna. Oddly enough, using anyone else doesn't really help without Trio of 9999 or a Perfect set of Attack Reels. Summon if the Overdrive Bar happens to charge all the way, or to finish off a form.

Additionally, bip, you don't need rigged to beat BFA. I beat this guy with 3500 HP on Auron and couldn't do more than 2000 damage with an attack unless I used Curaga on a Zombied BFA. You should be fine.