Good to hear the driver is better contact, now you can focus on the iron heel shot as the worst miss confidently.
The low point bowling alley is drill to help you calibrate the club movement. For some golfers, calibration drills work to fix problems without getting too technical, but some people need more direct ways to influence the movement. If you are bending your arm to hit the inside line, then you caught yourself cheating and need to focus on the inside line with weight shift or posture.
Looking at your swing for heel contact, it looks like you set up toward your heels too much, so your armpit is more over the back half of your foot instead of over the balls of your feet. This oftentimes causes the body to move forward as it seeks the balance of the foot. Moving forward toward the toes is a big culprit for heel contact.
Try this drill and then use this idea of weight shift (instead of arm bend) to do the bowling alley drill.
https://www.golfsmartacademy.com/golf-instruction/heel-toe-awareness-alignment-stick/
The reason I'm not sold on the over the top causing the heel hits is because the two shaft parallel checkpoints (good for approximating path) don't show a big over the top move. Usually an over the top heel shot would have the club outside the target line before contact, and your club doesn't get there.
Glad you're enjoying the process. Being your own coach doesn't mean you're alone in this. Just that you have the final say and have to own the solutions!