There has been quite a bit of work on the yip issue in golf. One interesting line of argument/advancement is that tracking eye movements tends to show who is going to have/develop yips. Yippie players have eyes that dart rapdily all over the place before they hit a shot or a putt. Players without these issues tend to have "quiet eyes," which look to specific spots and tend to stay there. It's crazy how much of what we do is connected to, driven by, and revealed through our eyes. The fundamental premise of my views on flinching in pistol shooting is that the flinch starts with the eyes. Therefore, if you can fix the eyes (keep them open and seeing), then the mechanical flinch will go away.