Since I have ways to reset the stacking debuff aura its pretty simple.

Do as you'd normally do. DPS boss to 66% ( I think thats the transition).
Make sure he doesn't heal from the debuff that he puts on a single target (you just need to move that toon out of the group manually)
Then I just jump down to either of the levers use the ret paladins to dps down the snakes while the tank DK channels the lever.
Run up the stairs, then run down on the other side for the other lever, try to pull as little snakes as possible.
Same thing at this lever too, palas aoe down snakes while DK channels the lever.
Run back up to the boss, but do NOT interrupt him
Pop all DPS cooldowns you have and burn the boss down.
When my team is at about 20% HP I use Divine Shield and Anti Magic Shell to reset the stacking debuff,
I use 4 holy radiance to heal up while Divine Shield is up.