i had the same problem.. but if you get lucky.. its doable.

limit breaks are a big help, and make sure they are filled when you start.. this will of course mean youll be running away a lot when they're all full. buy lots of potions and you could use this strategy:

let everyone throw potions on themself until the limit break is full. Then use it and repeat.

if it doesnt help then youll really have to lvl up