As I understand it, it's 27HP *per round* until you cast all your prepated 9th level healing spell, in which cast your touch will heal 3 HP per level of the next highest level cure spell you havent't yet casted.
As a reserved spell, you must keep some cure spell prepared in mind and tap into the 'reserved power'.
I feel that we are digging deeper and deeper into the fire and forget slot system, meaning there'll be increased difficulty in evolving or replacing it...