I am still learning on TGM and currently process to trying to feel the #3pp from top to impact and also working on the pitching position.
I used a single strong grip, such that when moving up (imaging a plane and move along with it) and try to get an open palm (facing upward of the plane) at the top. Coming down trying to sense the #3 and direct it to the ball along the plane, therefore getting the elbow in first for the pitching position. I hope this is correct, at least it works for the woods on the tee. For the iron, I found that if my wrist is tight, unable to uncock it quickly, will hit a fat shot.
Before that, I was using a weaker grip where the #3 just slightly on the right of centre, isn't it true if using this grip and getting into a open palm at the top you need to have more rolling on the right arm, otherwise your right forearm more facing down and coming down it will get into a punching elbow position naturally?
Thanks.