I like stacking Piety as well at around 1/2 of my Mind.
With the MP cost scaling and general DF skill levels, the extra MP pool helps.

Its funny cuz... sometimes a derp party needs me to pull extra cures out of my butt.
And I do.
Thanks to pie.
^T_T^

I guess at end game I'll transition from being a beast of burden and streamline my stats.
If that's whats needed then anyways.