What are your resists? I had similar dps to you when I killed him the first time, but around 300 - 350 resists. Didn't have any LoH or extra poison resist. Dunno if this will help but here's what worked for me.
I was using a kind of run-and-gun build. Standard spirit walk/soul harvest, with leeching dogs, garg, firebomb with pyrogeist rune, and fire bats. I forget what passives, but they were shitty (lol). Basically all my stuff was damaging him if I had to run out of poison or kite if my pets died etc.
Strat was staying way out of range, going in a circle around the outside of the room. I stacked the pools as close as possible so they'd start disappearing by the time I got back around. Pets all died a few times but could usually get them back up before shit got real.
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I was using a kind of run-and-gun build. Standard spirit walk/soul harvest, with leeching dogs, garg, firebomb with pyrogeist rune, and fire bats. I forget what passives, but they were shitty (lol). Basically all my stuff was damaging him if I had to run out of poison or kite if my pets died etc.
Strat was staying way out of range, going in a circle around the outside of the room. I stacked the pools as close as possible so they'd start disappearing by the time I got back around. Pets all died a few times but could usually get them back up before shit got real.