I'm really starting to suspect I'm one of the few people in this forum who actually likes the fact that healers in this game focus on trying to minimize their gcd healing and try to push out as much damage as possible. With that being said, I'm of the mind of WHM's getting better options for weaving and minor utility.

Personally I'd keep the core identities they already have the same, with minor adjustments.

WHM: High personal dps, minor raid utility (emphasis on defensive utility more then offensive) Solid emphasis on pure healing with limited shielding.

SCH: the healer who should be the middle ground. Moderate personal dps emphasized with sustain and damage over time., balanced raid utility. Higher emphasis on utilizing your pet to optimize your play.

AST: Low personal dps, High raid utility (more offensive oriented). Straightforward healing emphasizing mobility and buff manipulation but ultimately lacking compared to whm's output and sch's potential.