I would like to find out if there are particular exercises for problems with hand structure. I have been playing for 30 some years and discovered 10 or so years ago that the muscular structure of hands can vary.
My problem was or is that I have a small curved little finger of which I had very little dexterity and difficulty moving my fingers independently (I can't give a Vulcan greeting without working on it a little while and I can't bend just one of my fingers without the rest of my fingers bend some also). Which explained why I was a three finger player.
I created various physical therapy exercises and over the years have been able to create a sizable improvement in my control over the my little finger, however only to some extent. It also appears that the little finger problem is linked to a problem with my ring finger. I don't have completely independent movement between the ring and little finger. For example I can't bend one without the other fingers bending also.
I understand from what I have read that this is not an uncommon condition, however, one I am not content to live with. I practice 3 hours every day and am willing to do anything to help this problem.