Nice. I love your garage set up. Slo mo camera too. Just need a launch monitor.
You do what I do, or did, with my left wrist. You get it a little arched at Top. Maybe an old left over from trying to have it literally flat? Research "geometrically flat" to see what it should like at Top. Or for a simple drill , grip the club with just your left hand as you normally would and cock it straight up in front of you without any "horizontal wrist motion", "vertical motion" only. Depending on your grip type you should see some cupping to the left wrist, this is the new flat, geometrically flat.
In short you have a little tiny Nancy Lopez like left wrist roll and off plane left wrist cocking due to some Horizontal Wrist Motion on the left side. A very slight break down in the Left ARm Flying Wedge. But it'll tend to take you under the plane going back and then given an equal and opposite deal in the downswing.... under then over the plane coming through. At its worst I looked like Zoro at Top. Its very slight for you but still something you should take a look at. Your plane is good, but this would make it really good.
For me the solution was finally realized when I froze my right wrist bend. A great thing for Hitters. It was the increased bending in the Right Hand , a false feel wrist action that really got me arched at Top. Try to smash the ball with a frozen Right Hand Bend and on Plane Right Forearm Flying Wedge. The degree of right hand bend should remain intact throughout if you startup from Fix or be quickly assembled in Startup if you Startup from Adjusted Address. For some reason I tried to bend the Right Hand to the maximum , a false feel.
Even when Hitting the #2 Angle is important. You may be loading and thrusting the Right Elbow but the #2 Angle still plays a part Id say and it needs to be cocked and uncocked on plane. A pure Vertical Left Hand Motion. The Arch if taken all the way to impact will get the face open, so if you see your shots pushing out to the right take a look at your Left Wrist at Top. This was something that I could get away with when Swinging but when I started Hitting and tended towards Angled Hinging the Arch , small though it was gave me push fades for the first time in about 20 years.
Since your Hitting now you should also maybe take a look at Single Wrist Action vs Standard Wrist Action.
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