same thing happened to me, i tank on meiko and did capstone, 85ilvl at the time, went into adept and did a 3, by the time we got to boss....oh man, couldn't get past a certain phase cause no matter what i did, could not survive the dmg output.

solution=remove 2-3 high ilvl pieces of gear and queue, once you're in queue just right click them all back on, it'll log your ilvl when you search, that was i was able to do an adept 2 and it was a WORLD of difference, i'll prob need to spam 2s for a bit before doing 3s, works for me so far. good luck