I tried this the other day 85% passive. My problem is a few of them are still getting behind me. Running it in 3 pulls. Question is where is the sweet spot to pull them all to that they can't flank you? I was trying with my back to one of the pillars where you zone in but a couple seem to get up on it and encircle.
Note if you borderline like me: Earthen Elixers are cheap(on my server) and can reduce the damage taken a fair bit. And StormChops rock for this.
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http://armory.worldofwarcraft.com/character-sheet.xml?r=arathor&n=bubbabill