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Trail hand wrist in flexion at P1? Same GIF as above. That's tough to do.

Yes, correct. Trail hand wrist in flexion at address. And grip up in palm.  I mean he is hitting duck hooks. You can hit them with any path with trail palm turned under the grip. I wouldn't eliminate that as a possibility sight unseen.  Extreme outward path highly unlikely for a high handicapper. $5 says trail palm cradling the grip from way under.  

@ChetlovesMer, I think @GolfLug is talking about almost having the right or left hand under the club. Like extreme strong grip. I would say DJ has one of the stronger grips. The V in his right-hand points towards his right shoulder. Like up his right arm.  I can see two ways to hit a duck hook. In my mind, a duck hook is caused by an extreme in to out swing path. I do not think grip strength is highly correlated with swing path.  DJ has a very strong grip from a PGA Tour perspective, and he hit fades off the tee. Morikawa has a strange weak left hand, but strong right hand and hits fades. Rory has more of a neutral grip and hits draws.  Yep, this ^

That'd great. I love indoor practice in the winter. In all seriousness. don't be afraid to go out and get lessons. It can take a while to find a swing coach that's right for you. I've had a myriad of them, some good, some not so good. One that I'm actually friends with, but he wasn't right for me as a coach. I work with @iacas these days, and he really helps me... I call him Yoda. I'm sure I improve more because of his lessons than I ever would on my own. Finding a good coach can be like finding the right spouse. ... possibly more difficult depending on where you live.  Secondly, don't be embarrassed to post a MySwing thread. A lot of golfers are like "eh, I don't want everyone to see how crappy my swing is." Don't be that golfer. Be the golfer who says "My swing needs work. Here's where I am at the moment."  Anyway, that's my 2 cents.  Enjoy the indoor facility, but time the snow melts away in the spring, you'll be ready to go. 

Thanks for all the thoughts and tips.  I truly appreciate it.   I’m going to work on it this winter at an indoor golf facility.