A couple of things I have been working on which seem to help me.

1) Switched to the claw grip. It seem to take the twisting of the right hand out of the stroke

2) I try to feel as if I am tapping the ball without too much of a follow through. The longer the put the harder the tap. It seems to keep me accelerating to the ball without fear of twisting the club head

3) Put a circle around the ball and line the circle to the hole then keep the putter head perpinduicular to the circle. At first when i stood over the ball it felt as if I was aimed very left of the hole.