At 310 your noticeably more powerful, at 315+ you even more powerful, and everything drops like flies. So I'm def grinding for 320. The challenges are not even real challenges, I don't know why you wouldn't want to do them, it's guaranteed loot at 310 NM, and 320 HM. Warpriest this week you don't even have to try to complete it with a good team. Don't care about house of wolfs, and looking at my rank 1, it looks like I never cared!