First off, this is moving in a great direction for RS and addressing many of the high-level issues with the tree, so well done
RS is by nature a "non combat" tree...a T5 RS is a build that's specializing in party support, it doesnt actually help you kill stuff any faster. So that, I think, justifies giving the tree a bit more "value" than a comparable combat tree might. I wouldnt be worried about, e.g., switching Raise Dead SLA to Resurrection SLA, as others have suggested. You really want to incentivize people to take this tree by making T5 RS a seriously attractive healer/party support, competitive with Beacon despite FvS getting bonus HP/SP etc.
CMW SLA is a nice touch, though it kinda handcuffs the tree to being a caster Cleric (you really need Emp/Max to make it worthwhile over just spellbook CMW). Maybe move CMW SLA to T2 (similar, again, to Beacon and CW SLA) and move the new Improved Turning down to Core 2, since more turns is useful for any RS with so many of its abilities being Channel Divinities. Then, Heal Domain clerics or Warpriest/RS could simply save their AP on it.
Divine Healing is still an odd duck...I'd like to see it scale on something, to help keep it relevant through endgame. If not Positive Spellpower (and then scale it down to 1d4/2d3/2d4 or something), then maybe at least give it +1 per Cleric level (max 15? 20?)
While making the tree cheaper in terms of AP is definitely needed...it does kinda neuter the Core 1 ability too, since you're not actually spending nearly as many points in the tree now. Maybe change it to 1 Universal, 2 Positive per AP spent. Again, going deep in RS should make you a totally awesome healer, dont worry as much about it being OP. Side benefit for Water Domain clerics too, who currently dont have nearly as much love as Fire and Sun and Air.