I'd try to make progress off the clays range with dry firing. Try to use different muscle groups, for example making sure mount and grip pressures are consistent, and train to move the trigger finger, without the rest of the hand moving, much. Make sure vision is following the target, not the muzzle, maybe little wall targets at different distances and spreads, with maybe a swinging ball and a target or two on the big screen TV.
Then, off to the range, by ones self, and put it into practice. Many problems can be broken down to simpler components, and it might show a direction that helps. I believe it takes time and some commitment, and give yourself honest feedback. Make the process second nature again and put the focus on the target. Best of luck with it.