I would say the difficulty only really ramps up ~170ish. After near wiping there my party was suddenly like "shit did shit just get real?" Was fun navigating the dungeon and being strategic about mob pulling-- "snipe harambe over here lets kill him before he starts spamming his debuff. We can kill him before the patrol arrives!" But a luring trap got us on floor 189 ish. So close and nothing a pug could replicate or survive without heavy nerfs.