Made a little progress today. I focused on keeping my firing hand loose, just tight enough to press the trigger, and gripping primarily with my support hand. It helped me to envision opening my other fingers on my strong hand AS the trigger finger pressed rearward. Just focusing on this kept me from tightening my grip as I pressed the trigger. I soon found that I could sense my other fingers were relaxed and the only thing moving was my trigger finger, back and forth. This was zen-like and only happened a handful of times, but I recognized it when it happened.
I also doubled up on hearing protection, which I've been doing lately. This DEFINITELY helps with the conditioned flinch response. It's almost like someone else's gun was going off, far away, and mine was just moving in my hand.
Also, put three sheets of printer paper end to end, vertically, on my cardboard target today. So I had a tall, narrow white column as a backdrop for my sights. For some reason, this really allowed me to see what the sights were doing in recoil. I wasn't aiming at anything in particular, just the top area, middle, and then bottom, so I could devote most of my focus to what the front sight was doing. I saw how different grip force on the gun made the front sight return in a slightly different place. How moving the support hand heel up a bit, rotating it more forward, had one effect, and bringing it down a bit on the grip had another. I think for me, not getting so high up on the left side of the gun with the support hand makes the sight track straighter, but I'll need more testing to verify that. It's just something I thought I picked up on today.
I'm realizing that it is not only seeing that's important, but recognizing what you are seeing that is crucial as well. But you guys already know that