I got a touch of that about 15 years ago. What I did was put great big spot up on the target at about 10 yards. I'm talking about 2' in diameter. I could focus in and float the pin in the middle of that huge dot, no problem. After a week or so, I went to a little smaller dot and backed off, like 18" at 20 yards. Then 12" at 30. I stayed at 30 and just kept reducing the size of the spot every week or so, 10", 8" and so on. Every time I'd relapse a little, I'd go back to the larger dot and/or shorter distance and work it out again. Kept at it until I was back on regular targets. You've got to retrain the brain and it takes time and patience to work yourself through it.

Keep in mind what Phil said about floating the pin. Saying the pin settles does NOT mean it's motionless. Nobody is steady enough to hold that thing dead still in the center of the dot and trying to will drive you bonkers. It's probably the root cause of your problem. Just relax, let it float around the spot and let the shot happen. Somehow the release manages to come when the pin is right.