Thom,
Certainly many areas that you could work on- some of them listed above. It's more of a question of which ones "you" want to attack first- that seem within grasp.
Personally, I just look for the area of the movement that seems the furthest from correct. It is readily apparent - not only in the full stroke but in the putter stroke also- that you have no finish location. If you want to use Golfing Machine terms - then the Finish is part of the Star System Triad and it should be a goal to get to a specific location- not merely "impact fallout".
On the full stroke you work on maintaining your "still head" all the way through to the finish. That will retain your waist bend.
On the putter stroke you don't let go of the grip after the practice stroke- that's not teaching you to hold the finish or your grip.
For both - you hold the finish until the ball has hit the ground on the full shots and hit the bottom of the cup on the putts. The simple approach is to ask yourself how many pros- let go of the club and start walking to the hole on a 5 foot putt before the ball begins to fall into the cup?
Simple stuff - but important basics. They give you "control" over the movement. Basically you want to get rid of your post impact blackout. That's similar but different than the alcohol induced blackout - that Bucket experiences every night.
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Life Goal- Developing a new theory of movement based on Brain Science
Interests - Dabbling with insanity
Hobbies- Creating Quality