I'm level 38 and he is level 40. I am using a pretty standard WD build, SW+SH->Dire Bats.
I think the main problem is my gear. I've got almost 2.7k hp, and he has just over 4.3k. The main stat I am going for is exp/kill to get 60 faster. I figured if I am higher level, it will be better than a few extra stats and I can get better gear from higher level stuff. I'm at about 150 xp/kill.
With 5 soul harvester stacks my bats hit over 1k, over 2k when they crit.
Can anyone offer some tips? We have to kite basically everything, and if we can't kite it, it just destroys us.