Unfortunately you're an AST and they are kinda the 'main healer' right now. WHM only really brings a deep mana pool and personal DPS to the group at the moment and SCH is still trying to find it's kneecaps after it's brush with the nerf bat.

Also I always go into a DF group with the outlook that the other healer has firmly secured their pants to their head. Normally I am pleasantly surprised to find the opposite is true but then there are those times I am right...