Puprope and pupropu are not useful here. I'd try to level (if possible) Kem and Odin. Odin has very high DPS, and Kem has +20% and + 30% DEF to spears, so two activations will grant a x2 DEF to al your spear members. It really, REALLY helps. S'naip is a beast, but without Manmer in your team to set negate circle of carnage, he will receive tons of damage as most enemies in this dungeon are swords. Perhaps a +20% HP Otomo could help. I'd also put hearing otomos (healing rod or wands) in some of your characters to ensure some healing is always possible (I'd put them into Kem, Rikken, and perhaps Suoh).