I have charge on all my characters, so when they get low i usually charge until it succeeds twice in a row. charge two successice times again when mp reaches around 15.

that gives me about 2 uses of cura though, so it gets kind of annoying. how much do you think mystic armor would boost mp at this point of the game? most of my characters are 22-30 level range.

oh and i use vaan as my leader, i don't use gambits with him, i just treat him like a character from the older turn based final fantasies mashing square when i get to an enemy, choosing steal, then attacking or healing/ curing ailments when needed.