Fuuuuuck the chapter 9 boss is such a pain in the dick. I'll get him eventually, just a few more tries.
He's easy.
Use rav/rav/com on the heads, heal when necessary, take out the heads first. Preferably the far right ones (?) because they have powerful magic than the left ones iirc. Then take out the main boss. When he starts to go into a stance, keep attacking him and it'll lessen his attacks strength. Heal when necessary.
If you're really having trouble, make a med/med/sab paradigm.
Hah, nice. I tried it again right after making that post and beat him. Chapter 10 ahoooyyyyy! 
Sab is a very important defense paradigm, as is sentinal, but sab especially as it debuffs and makes those hits go from 100 hp hits to 1000, 2000, 3000 hp hits.
A general rule of thumb with Fang, Light, Hope party is to make Com/Sab/Sen party default. This debuffs from the get go, as well as gives the party some tasty buffs. Then I switch to rav/rav/com, and it's mindless battle city. zzz.
Annnnnddd...whoops. In that post I meant med/med/sen. As it takes attention away from two other party members, as they concentrate on healing. It's worked well thus far.
And yeah, I think that battle was stupid. Typically in FF or hell, in most - if not all rpgs - when a boss goes into a stance that means it's time to go on the defensive: healing up, castling shell, protect, whatever, because you KNOW that attack's going to be powerful. Making the tactic the complete opposite was cheap, time consuming, confusing, and just all about stupid.
