Last year with 5 shaman I found both bosses to be pretty easy. This year I brought a tank into the mix and coren is pretty easy. I recently got my paladin to level 80 and geared her up pretty quickly. If you have enough gold then you should be able to gear out the tanks pretty fast.

A few questions.

Why do you need 2 bear tanks? Wouldn't one tank be enough for both teams?

As far as tanking I think you can get it down to a one macro.