I don't think you really get Greatswords until much later tbh, around or after Draklor. They're more or less a late branch off regular swords (more attack power at the cost of being two handed) rather than their own distinct weapon type. Also Berserk really is so stupidly powerful in this game, isn't it.

Re:job maxing, the fact that you can get up to 4 Golden Amulets relatively easily (1 from the sandsea, 1 from the Barheim key quest, 1 from the bazaar and 1 from a hunt) and you don't really have a reason not to keep them on your reserve party at the very least probably plays a big part in that. At least you get a way to still make something of your superfluous LP soon, IIRC.