I'm with Crop, I never found shifting Paradigms to be very strategic. Especially when you get your full party. You basically have two paradigms: Offense and healing/buffing. That's all you really need.

The only battles that are hard in this game were ones that require you to kill the enemy quickly cause they love exploiting that "kill the leader to get a game over" ploy. If Barthandelus didn't have Doom, I would have beaten him the very first time cause that was the only move I couldn't get around, until I finally upgraded my weapons, it didn't require a new strategy.