The feet caught my attention as well. Coach Baker gave you a good cue to leave the pivot foot down flat through the stride.
I also stopped the video at a few points for footwork, but I was focused on the front foot. It is straight on with home plate too early, in my opinion. Opening too soon is a major velocity bleed. Once the hips are through, if you are not transferring that energy up the trunk at the right instant, then the energy is gone and the result is the all-arm 82-85 mph that we hear about all the time.
What I would have liked to see is the outside of the foot facing home plate longer, which would mean the hips would be closed longer, delaying your hip turn and compressing the timing between hip turn and shoulder turn, increasing torque.
The front foot staying lateral longer will also help keep the pivot heel down longer.
If you focus on keeping lateral movement toward the plate for as long as possible, your brain will straighten out your landing foot at the right moment on its own. You will land harder and increase your catapult effect for getting up and over your landing leg, which is also a problem in your delivery.
You are a bit low on the front leg through trunk rotation. Think of the bent front leg as a shock absorber. The more bend, the more force is absorbed / lost. The straighter it is, the more force is passed up the chain.
I paused a frame at release where your trunk is tilted toward first base and your foot is landing slightly open. Trunk tilt away from home plate is a momentum / energy bleed also. The front foot change that I mentioned before will fix that as well because it will be impossible for you to land with an open front foot.
The open front foot also leads to a problem with front leg stabilization. The calf is not vertical. The knee is closer to first base than the ankle. You want it aligned vertically. Staying closed through the stride fixes this also.
I don't like to upset tempo in a pitcher, but I think one other thing is important to note. Your first movements are very slow. If you were more explosive with your leg lift, it would increase the tempo of the rest of your delivery. Speed early has a multiplying effect. Incorporating that early speed and explosiveness will also increase how hard you land and add to the potential energy of your delivery.
Your lift, as it is now, seems a bit lazy to me. Again, just my two cents.
As Coach Baker says, there is a lot that is good about your delivery, but there is obvious potential for more MPHs.