i wouldn't try that right now since i'm done with the game and my last save is right before the final boss.

is it true that if you fight alone, then the amount of exp you get triples because you used to have 3 people in your party so the exp have to be evenly distributed? It worked for FF3 and also valkyrie profile. I didn't try it on FF12 yet. If it does, then it'll be much easier to level.