You have to have hit a grindwall hard to reach the point where you can kill any trash on f30 and the point where you first explore it as well..or something earlier than that. Because there's not an effing chance you can kill any of that trash at like level 250 or whatever it was when you first reach that floor. Many of them are capable of ohkoing you before you can even move at that point.
Anyway I updated the first post, but just to re-post here in case you guys haven't noticed, be careful with NG+ files in 2.04, not only will you rlevel drop down to 1 if you re-recruit someone (which isn't a big deal since it remembers your exp), but it deleted any equipment that character was wearing, in addition to resetting all your skill levels to 1 (and no your skillpoints will not be reimbursed).
edit: I'm convinced suwako is like the F27 boss where her stats are seemingly randomized >=P. I KNOW on my first playthru, I accidently bumped into her before I was nearly done exploring F8, and I didn't level up yet at that point in the game, I had many characters lacking tp and sp, and she was still easy as hell. Nothing she did would ever hit for a whole lot.
Ran into her now, she ohko China...with destroy magic.. wut tf.. After that she iron ringed my other dudes for over 1.5k.. seriously weird.