The priest part looks almost fine, I would put at least 1 point in Sacrament, it adds another line of damage.
About Aspersion… It doesn’t scale quite as well as you’d hope. For instance (let’s assume max Aspersion which is +48%def, I’ll use 50), I have 200 def from armor which negates 200 physical damage, I use Aspersion I now have 300 armor and negate 300 physical damage. Even with 200 armor at lvl 200+ mobs start hitting 2k+, so negating 100 extra damage isn’t amazing.
Aspersion “scales” well, but Def doesn’t scale at all, so it doesn’t really scale anything.
The extra def will help a little, and it’s not like you have a ton of options for those points. But honestly Aspersion just eats a buff slot. Blessing and Sacrament would be “better” especially if/when we get the ktos Blessing patch.