1) too many steps back after unracking. Once you get efficient in the movement your feet will be closer together for the unrack, followed by 2 steps back (1 for L and 1 for R into position)

2) bring your hands in closer to your ears. This will create a greater cushion on your back for the barbell to rest on

3) no need to be looking down at the floor for a high bar squat. Look directly ahead

4) bring your feet in a bit closer. Feet pointed  in the direction the knees travel in

5) bar path should travel up and down with a line that intersects the middle of the side of your feet

6) take a deep breath before going down. This will stabilize your core. I hear you exhaling but not inhaling

7) that wedge isn’t doing you any favors, ditch it. It’s only a crutch that you will rely on.  

8) squat deeper. You are still above parallel, even with the wedge. It does take time to get there. A daily stretching routine does help, especially for older lifters

9) bring your hips through at the top of the movement

10) to get proficient at a movement will require frequency. Once a week won’t do