I don't understand what the issue is. The only thing WHM has over SCH is burst AoE healing, and not having to deal w/ a pet dying. Everything else (single target, sustainability, etc.) SCH does better. I think the only thing SCH needs is pet control improvements and pet skill macro support. If SCH gets medica, there would be no reason to bring WHM at all.
The best healing lineup for 8 man parties is 1 SCH 1 WHM.
