From day one playing it I aim also for Crit/Piety build.
I am a scholar main so maybe thats why I go crit > det as even my whm has a semi crit build (still level 50 470 crit). The need for MP seemed to me obvious as I need to spam bene 2 a lot, while on sch Adlo spam is just bad playstyle and a huge waste of mp except for the use with ET (my opinion).
I just love when ED crits and the current weapons serve my opinion even tho I didnt get yet to get my AST the 170 weapon and am still on Library globe.
I consider getting a new weapon and try AST after changes in T13 for today's raid. I been as level 55 in there before (got queued up while fateing and went oh well lets try) and I think AST didnt make the healing much worse.
AST is still new ill be toying with diff builds but crit piety for now it is for me