Not to gang up on you, but SCH's single target healing potential with just Physick and Embrace (not even using Rouse) exceeds that of WHM and is indefinitely sustainable under normal circumstances. A WHM would need to spam Cure II to compete with that output, and that isn't practical at all.
WHM is and always should be superior at AoE HP restoration.
SCH is there to blunt incoming AoE damage, and besides; there are few situations in the game where parties eat unavoidable, large AoE damage back-to-back without the opportunity to heal up.
Don't limit yourself by thinking that SCH is weak. You're just trying to make it fit into a WHM style, and it doesn't.
