ok I finally beat this guy, heads up to those that suck (like me!) and cant kill him. I decided to go one battle without actually dpsing(just healing) and see what happened. Well my paladin RARELY if EVER got hit by the boss. Then I notice my chain heals were healing the same two people first! ARRRGGH. So then I hardcoded in the targetting to make sure it targets shaman only and DIFFERENT shaman(so tank only gets small heals from jumps). LOL I felt like an idiot when I realized that. So then I decided to go all healings totems and just remember to use my watershield buff every 15 secs or so. I never ran oom and never came close to it. I would rotate dps dps the chain heal. I also used the trick the original poster mentioned for positioning. The paladin supplied the cold resist. No shaman ever went below 50% with this setup and rotation. Oh just make sure to consecrate the ground to pick up adds (they hit for nothing, but it sucks when they are smacking your dps). I think I can reliably farm this guy everytime now.

Oh another thing, keep your dps right next to tank since aggro is not an issue in this fight (boss ignores the tank). It makes sure your tank gets healing jumps from chain heal and keeps all adds within consecrate range.