It depends on what you want to do. If you are doing alot of pugs you want to have an eye on your piety to make your life less stressful. If you want to min/max you should go DH.
The "increased" healing from det can be totally ignored since it doesn't help. SPS is useful until a certain threshold which you want to reach.

There are several suggestion for AST... If you want to go full damage and you are comfy with your group (and co heal) and know what you do take this:

https://etro.gg/gearset/f76ddad7-1cf...b-cd63598157b0

If you want to be save, you go with this:

https://etro.gg/gearset/52af7fb2-66b...2-e4c064030d96

If you still have issue to manage your mana, you should go Piety until you feel saver.
The builds were provided on the Balance Discord, its a useful resource for builds and stuff.