I recomend you do Conclave HC with priest/rogue/unholy dk on the wind platform, paladin/mage/hunter/demo lock on nature and druid/resto druid on ice.
Tanks can switch on 80 energy and the priest should switch too. You should be fine with this setup just make sure the shield goes instant down and your healer on the wind platform should use the tol barad trinket. The adds on the nature platform can be fixed with an well placed frost ring and then slowed & ae'd with fire mage/hunter/demo lock.