[EdZ]

I've been working on supinating my left wrist to help avoid breaking down at impact. I've been using a Tac Tic as feedback to insure that the left wrist remains flat. The problem is that my effort to supinate is leading to a severely closed clubface at impact. I'm following Hogan's suggestion of turning the left palm up at impact per his instructions in Five Lessons.

So while I'm getting improved lag and compressing the ball well at impact, the shot pattern reveals a ball flight that is initially straight, but hooks significantly at the end of the shot. Any advice?

In addition to the weaker grip, key on the right hand staying bent back and not feeling the full swivel (something I would only tell a someone with a hook). Driving the bent right wrist down the line, while feeling the elbow pockets staying face up. Hit some punch cut shots to get the feel, stopping at both arms straight.

all of that assumes you are getting good compression and are not leakage hooking. You'll end up with an arched left wrist position (and potentially a bit of a push). The combination of the arched left and bent right tend to counter balance each other and prevent the clubface from closing, sort of a Trevino push/cut results, and if you then get the feel of swinging more left, you'll be close to what Hogan did.