LBF,
I find that MB and I generally agree on all form issues. It's almost as if we went to the same coach!
So, the only additional tip I would offer would be with how to get into your back. Fortunately, as a compound shooter, I used a Stanislawski 'back tension' release throughout my competitive shooting career, so that was not an issue for me when making the transition to Trad shooting.
The major muscle you want to employ is the "trapezius", which are the two flat, triangular muscles, that start at your shoulder and go down your back on either side of your spine. They are the muscles you use if you want to 'squeeze' your shoulder blades together. As a matter of fact, that is the action you want to employ when getting into your back during shot execution.
When learning to use this muscle group, it's probably easier to do so without the bow. Hold your bow arm out to simulate holding your bow, and come to your anchor position with your draw arm, making sure that your have the proper alignment. Now, flex your trapezius muscles and try to make your shoulder blades meet at your spine. If you rotate your head to the right (Rt hand shooter), you can actually see your right elbow move towards the center of your back. Just "squeeze"/"flex" and relax, repetitively to get the feel of the action required.
You'll find when your holding your draw wt that you probably won't be able to flex/squeeze your left trapezius, but you will be able to flex and hold your right trapezius, and this will prevent your hand from being able to fly out to the right upon release.
I find that using a blank bale with eyes closed is the best way to focus on training muscle memory to become an automatic part of my shooting form.
Gook luck, & Have Fun!