Notice in photos 6 and 7 (where you are getting to the Top position of the Backstroke) your Club is off-plane. It is pointing too much to the left of target because if there was a laser emitted from the butt-end of your club, it would be pointing outside of the Straight Plane Line, rather than Tracing it. It could mean that you're using a Open Plane Line. So if you do not make any compensations during the Downstroke, your Clubhead will be coming Outside-In! As we can see in photos 8/9/10, you have made some of the necessary compensation needed, but was it enough to create an Inside-Out Impact? A better question to ask is, 'Do you want to be making compensations?'. So make sure you're On Plane at the Top.
PS: Note that your Clubshaft should actually be pointing to the left of the Target Line, only because you have not yet reached the "Clubshaft parallel to the ground" position. But you must be Tracing the Straight Plane Line!
In photo #7, note the position/alignment of the right forearm/elbow to the plane and clubshaft.
I realize this may not be the very top, but with all that is being tossed about, I am not sure that most of those comments are not just symptoms.
7-3 discusses the position for both hitters and swingers of the right forearm. Granted it appears that your left wrist maybe arched, which can take the secondary lever off plane, but your alignment of the right forearm appears to be caught between hitting and swinging. It should either be vertical to the plane or vertical to the secondary lever you are kind of inbetween.
Given this alignment, if the photos and analysis are correct could in fact address the symptoms and descriptions noted in the down stroke and follow through.
Plus I can't tell if you upper body has any horizontal sway, but you definitely have some vertical motion with the upper body, which most likelly results in a lack of a stationary center.