Maybe this can help:
Make a very fluffy ball out of some paper towel or hankerchief and hold it softly in your palm with your ring and pinky, and use this as an aid to teach your ring and pinky to relax.
I used it to learn curling in my ring and pinky while using fingerstyle, since I had problems with them sticking out.
Now I understand your problem is gripping too tight with your ring finger, but maybe it can help your ringfinger to be more aware of the problem. Could work in both ways maybe
