Seriously, let ramza spend some time as either a chemist or a dragoon. There are going to be times when you'll have to fight as him alone and either Auto Potion or Jump are completely necessary. I recommend Auto-Potion. It's the cheapest thing in the game, selling off your potions and Hi-Potions and recovering 300 dmg whenever you get hit, but there's at least one battle where it's basically one of two ways to survive.
White mages are not really all that, because spells like life, protect, and shell can miss. However, there isn't THAT much healing otherwise. It really is worth having some sort of character with white magic secondary.
without throw item, items are a lot less useful. And chemists don't last the entire game, guns or no.