I like to create actor only skills and separate enemy only skills that "mirror" them to make "ninja monkeys". Example: If I go with the standard a.atk * 4 - b.def * 2 for the party, then I will use b.atk * 4 - a.def * 2 for the enemies. Now everybody is on equal footing damage-wise, so the advantage goes to: most HP and superior tactics (healing, buff/debuff strategy, absorption, taunt, etc.) Superior tactics should go to the party unless it's one wicked AI or the party is surprised, and superior tactics can even overcome an HP deficit, so...yeah...that's my mojo. Of course, you always have to test out your system in practice and gauge appropriate drops and such, but...that's just dilligent game design.