Though crit sounds nice I know how much I need to heal and when. So it is usually a waste.

SS is becoming useful as it not only makes spells faster but also reduces GCD. In my case if i was able to get SS without sacrificing Piety and Det such that Stoneskin was a 2.5s or less I'd be delighted.

PoM though is a great skill I feel it cooldown is too long and I only ever use it when I need to do a lot of buffs in a short space of time.
eg: prey in t10 during adds or Stoneskin then entire party in t11 before nerve gas.