I spam the X button a lot too. Weird. I have to consciously stop myself from doing it and sometimes I still do anyways heh.

I'm guessing you keep your characters specialized with the three roles they start with in the Crystarium? That's what I've been doing. It may cost a lot more CP but the boosts are big enough higher up to be worth it and as I've found the hard way, if you aren't up to date on your abilities you will get murdered. I keep everyone focused (hah) on their three roles since it's easy, even when I don't use characters in my party as interchangeably as I probably should. Habit, more than anything.

As for my setups, I've been using mostly:

Commando, Ravager, Ravager
Sentinel, Commando/Ravager, Medic
Sentinel, Medic, Medic
Sentinel, Saboteur, Medic
Commando, Ravager, Medic

The last slot changes a lot as I refine tactics depending on what I'm doing, but the above are my staples right now. Yes, I really need to be using a Synergist. Yes I am stubborn. XD I probably will once I get back to the boss I've been stuck on.

~DragonHeart~