penicillin
OG
Considering how long it takes to get AP at 99 beyond 13 points, wouldn't going straight for ashes to ashes the short way make more sense for instanced PvP? Seems like generating 5 holy power instantly on a 30 sec CD is waaaaay better than anything else. Plus you get unbreakable will on the way, which is great for PvP.
I had thought of doing this myself but found all traits along the (long) way to ashes to ashes of such benefit that I stayed on that path. You could be right, it might be of more benefit to switch somewhere along the way. Whatever you do, get to ashes to ashes as it really boosts your survivability and dps a great deal.