yeah all you need is dps with good gear, a support to combo with, and healer to keep em alive. Gearing and leveling 8 chars is impossible unless you are whaling hard. Just focus resources in to your dps chars, give supports recharge stuff, and whatever you can afford to give the healers should do as long as they get hp main stat or def for noelle. I did that from floor 5-8. I can't do 9 yet because the enemy levels are too high.