I posted a video
HERE showing how I handle the bunny boss. Drag all your toons to the top, run them across and position them at the opposite end of the room from where you enter. Tank the boss at the entrance and when he whirlwinds, let him get about half way towards your group and then taunt him back. He'll spend most of his whirlwind time travelling between your two stacks and doing no damage. The breath I just ignore, it does next to no damage and doesn't knock you around if your Shamans are backed up against the wall at the end.
Check your recount and see where most of your damage is coming from. The only real damage in that fight is if you're letting the bomb bunnies go off, which is easily avoidable by picking up hammers on your tank and smashing all the adds.
That video was made when I was in entry level gear, barely high enough to queue and you can see, with SD used on cooldown, my tank never goes below 75% and my healer spends most of his time casting LightningBolt.