[GooseofIron]

I think it boils down to ineffective thru pivot, causing you to still steer and quit (I know Yoda said that about Brad G, but you have the same problem, it's just not as pronounced as Brad G's is)

There's a definite flip in there at impact. Brian Manzella likes to talk about how the zipper should be moving ahead of the hands on the downswing. By "quitting" which causes you to flip, your hands are getting in front of the zipper.

A drill that worked for me (I'm in a similar situation, low handicapper who still flips) I worked on the left side connection drill (keeping a golf glove under my left armpit) AND keeping my right thumb and right index finger off the grip. Try hitting chip shots with the left side connection and the right thumb and index finger off the grip. It pretty much forces you to use your pivot to get the clubhead to the ball instead of using your arms and hands to get the clubhead to the ball (which causes an overacceleration of the clubhead and the flip through impact).

It takes some patience because the results won't happen overnight. And once you start to "get it" you will still be inconsistent because of years of flippng the left wrist through impact. And again, hit lots and lots of chip shots doing this drill and lots and lots of work with the impact bag doing this drill (most golfers go right to the full swing and make life harder for them).