Scott, this is a great point. For some reason I have started doing this very thing. My cue is sliding across the inside of my chest/under arm when stroking and I can't understand what's caused it. It's causing me to question everything I'm doing and I am playing badly when before I was not.
What can I do to correct this and get my thoughts focused on just playing while I'm playing and not every little thing all the way down to my grip and where my hand is on the cue. When I'm playing well I never pay any attention to any of that. So when things go wrong I have a hard time getting back to good because I have to look for different reasons of why it's going wrong and play through it until I'm back....lately I can't get past that point...all bad. Thanks!!