I've been using:

Tidus: LF
Shaami/Larbeight: RF
Zev Ronso/Kiyuri: MF
Deim: D
Kulukan: D
Nimrook: G

I just got Jecht Shot 2 and opened Sphere Shot via Tech Find for Shaami. Larbeight is not the best now, but his shot ends up as one of the highest. Next to Keepa's 99. Zev blocks and passes very well, and he can shoot good too. Kiyuri has an excellent pass and good attack. And Sphere Shot and Invisible Shot. Deim and Kulukan each have Nap Pass 3/Nap Tackle 3 and Drain Tackle 3. Nimrook just plain rocks.

Here's some random stuff:

Nimrook seems all right in defense of midfield.

All the Kilika Beasts start out weak, but they have great potential (Larbeight's SH, they get lots of HP).

Drain Tackle 3 is practically REQUIRED with Jecht Shot 2! (999 HP!!)