Trust me we all hit this wall at some point. Get his gear enchanted. Gear out your tank. The 2 most important items in the team are the tank and healer. If you gear out your tank it gets way easier. Once your dps gets better gear upgrades then the round robin lesser healing waves from 4x elemental shaman will be better but until then its best to gear one of them resto.

Edit: as multiboxxers we can't just stroll into any old heroic after dinging 80 and wtfpwn. 5 separate players who do this will struggle so for us doing all 5 at once we need to be even more prepared by having some good gear. Not saying full Naxx25 gear is required for us.. but a little more than your average 80's lets just say.