One other small thing I've just seen on your vid (if you don't mind me looking and commenting) which may explain that occasional pushy, slicy thing that you stated you get, and I know I used to get -

Leave your shoulders turned at the top. Your shoulders seem to be one of the first things to go into the downswing which will, even fractionally, push your club outside the line on the way down - hence slice if you keep the clubface square/open or pull if it's closed.

The way I got round it was to practice dropping my left arm down from the top of the swing before anything else moved. I'm only talking a foot - 18 inches, but it's enough to keep from looping over the top.

Try it iff you like. If not. Don't! Merely an observation sir.

Now where's my Benilyn?!