Got an email with a link to this thread yesterday, and I have to say the timing was perfect.
I have been swinging the club better than I ever have this year and had one of the best rounds of my life fairly recently. I played yesterday and had one of the worst rounds of my life. It was so bad that the guy I played with called me late last night to compliment me on my composure during the round as there was very little swearing and no club pounding or throwing, I just got to the point where I knew I would not be able to correct the problem on the course and just laughed at every shot.
Pretty much every full shot was a snap hook and I would look at the club after and see that it had turned in my hand.
I went to the range this morning after reading this last night and focused on keeping a correct grip. I hit the ball well again and most shots were straight or a slight draw. The feel of the club in my hand was so much better than yesterday and I can now tell that the issue was that the club was in my palm and not in my fingers. I have issues with arthritis and nerve problems in my hands so I sometimes tend to get lazy with my grip and think I had engrained that into my setup yesterday.
On a separate note, having those issues with my hands I played my first round yesterday with the Pure midsize wrap grips, and for the first time in many years my hands did not hurt when I was done with the round, and did not hurt after my range session today either.
Thank you very much for this reminder and very clear set of instructions on the proper grip. It has helped me a lot.