I have tank and dps shield, never have the healer shield. On the way up you can toss some heals, but the healer will get some aggro while nobody is able to attack from this so make sure you are able to snap aggro against that when you transition. I just move them up as a group without follow.

That transition with the shield and without the shield can be one that isnt very timely; separating the group can be a pita.