Outstanding practice technique, Jambalaya.
You have demonstrated the ability to learn,
placing you in the top tier of golfers.
My trick on this was to intentionally
cock the right knee towards the target
slightly. It worked so well for me that
I made it a permanent part of the setup,
just because it turned out to be such a
good reminder.
I had been told years ago by a Scottish
teacher that the one thing he would change
in all his students is a free lower body turn
starting with the takeaway. That can mean
even letting the left knee freely follow
and the left heel coming off the ground.
By now, you have probably recognized that
the fly in the ointment is the dreaded sway.
Your challenge is to anchor that right side
by maintaining the right hip pivot point. Yes,
you can turn the lower body fully while
maintaining the plant of the right side.
Now, the teachers have decided to
deemphasize the turn driven by the legs
in favor of upper body thoughts, something
to do with building torque. I don't
know, but the instruction provided in this
thread so far are right on the money. It's
something you'll have to work out for your
self, but as I say, I like the way you are
approaching the study. I make a big turn
both lower and upper, and it works for
me. For one thing, it gets me to the inside.
I have a diagram I call the Japanese double
hinged gate. Maintain the right hip socket
going back, then reverse the turn, still
maintaining the right pivot point, then
in follow through, establish a left side
pivot point and fire the right side through,
letting it swing right around the left pivot
point, just like a hinge on Japanese screen.