Help with Affiliation Warlock

[Moritz-emerald-dream (Moritz)]

Posted it here myself

Help please - not good - affliction

So i think im doing something wrong here I stack enemies during quest for faster swipes, 3 to 4 enemies at a time i cast corruption and agony (im level 22) and also Unstable Affliction while 3 of them running i use life drain. So here is my problem, i dont do that much of a damage… When i played as hunter i could take out a single target with 2 shots or 3 at worst, within about 3 seconds, so 4 targets would of been 12 seconds. but with my warlock its a struggle, i have to re-cast most spel…