Ok, have you ever tried with another build? like cb on phys or static on sorc? this warlock has little dmg if not built as a glass cannon. Most builds in the game can't actually kill a p8 t5 urdar with the "wrong" combination of auras and affixes, ppl dont realize this yet because 99% are playing ES Warlock right now. If not built as shown in this video, es warlock goes from S tier to not better than light sorcerer that is B Tier at best.
T5 wont be that important anymore anyways next season. Btw. I play a suuuper defensive Echolock with around 50k Sheet Damage current season. Zero DS, almost no + Skills, but all the defense in the world and I melt those T5 dudes in full games in seconds. If it takes minutes instead of seconds next season, I dont mind.