Another update. I know many of you have kids far better than mine so this is all "whatever" but for those of us whose kids are going through similar struggles thought this post-mortem would be helpful! Since the thread started, my son's been working on just simplifying things. We do 10 - 30 ft speed control drills for 15-20 minutes a day and then the Jon Rahm semi-circle drill for another 15-20 to practice the shorter putts. He's also started using a digital level to practice slope reading. And then this week, he worked with his coach on an abridged Aimpoint to replace his current method (which you'll laugh, some local kid showed him and involves calculating based on distance/slope the # of inches away from center to aim.) The entire goal has been to just free his mind when he putts.
So yesterday's tournament got off to a rough start. On 1 and 2, he had 30 footers that he 3 putted. In both cases, he got the first putt to within 3 feet and missed the 2nd putt. Total bummer. But then he went on a great run, started off by making a 20fter on 3! 2 putted everything after with a few first putts from 30 - 35ft. And sank putts from 3, 4, 5, 8, 9 (3x).
I'll caveat by saying I have no expectation that he'll putt like this consistently, but I was so happy for him and I can see it slowly starting to click for him, that he doesn't need to be perfect. A couple times, he putted 3-5ft past the hole and he commented at the end, that he felt such confidence being able to hit the comeback putt. Made 5 birdies which he hasn't done in a while!