1. Your stance is starting way too wide like 12-18". Start about shoulder width and stride 3-6" during backswing.
2. Your head is turning way too far back and is the first thing to turn back instead of the last. Your chin should be right over the lead shoulder at top of backswing.
3. Work on Inside Swing Drill backswing with rear foot staggered so rear toes are inline to front heel and your shoulder winds back right under your chin and inside the wall/posture. You are getting too over your toes/into the wall with your head/shoulders/knee.
This drill feels too easy. I must be doing something wrong. Is it posture related?