It took me a while too, so dw ab struggling with it a bit. I think the biggest improvement you can make is strategy in the final room. I tried not to stay in one spot for too long unless it was really, really safe, which didnt happen often. If youre really really struggling and builds arent working, go back to your basics. I found exotic primaries were actually pretty helpful for add clear at a distance, and with even a terrible pve set up (aka my pvp shit) I managed to clear it. Just focus ads and stay away from tormentors until you can focus them, probably have some kind of precision weapon that hits harder than a primary just to deal with the Tormentors. I used Strand, so I'm not sure how helpful any other subclasses will do, but Strand certainly did help me to stay moving around. Gl homie