I finally had my "light bulb moment" with pressure sensitive brushes and the opacity slider under brush settings in PS. I finally understand why I always make muddy color strokes...wish some body would have told me flat out to turn the opacity off unless I want a watercolor type buildup of color.
This is my Deadly Sin Sloth, doing his face and chest took me such a sort time that I wondered what was happening! He's nowhere near done but rendering form was so much easier with the opacity off...