Thanks for sharing the video! Fun times for us coaches out there.
Two things I'd want to look at (both eminently fixable) are your breathing and your hands' entry into the water.
On breathing, your head is moving around a bit more underwater before/after breaths than you want it to. The ideal is of course step 1: turn head to the side out of water, step 2: turn head to the side back into water. Your head wants to be more involved so has decided to break step 2 into multiple steps: turn head into water slightly past neutral with chin lowered
then return head to neutral
then lift chin slightly to get it in position for the next stroke. You can see this well around seconds 34-39 in the clip you shared.
The goal here is to have your head go back into the water right where you want it every stroke rather than overshooting in rotation and chin tuck. Some approaches:
- Drill: Imagine your head can only turn one direction: to the right. It can't turn left of neutral and your chin can't go up or down. Try swimming like this and see what feels different. Make adjustments as needed. (Example: Your chin really wants to lift up before every stroke? Great: That's the new angle that your chin is allowed underwater.)
- Think about keeping your neck and head relaxed as your body rotates. You can turn this into a drill by practicing exaggerated body rotation while your head stays in place. This will help you not turn your head past neutral as it reenters the water because it reminds your form that your head is being aided by your body's rotation to breathe but isn't part of it.
- Be mindful for a couple hundred of what your head is doing. Try focusing on a couple of different parts (what's my forehead doing? what's my chin doing?) so you can identify where you're immediately reversing something you just did and adjust away from that.
On your hands' entry into the water, you're entering a bit wide then bringing your hands to the entry position you want when they're already underwater. See, for example, seconds 52 to 56 in what you attached. Aim to have your hands enter more in 'directly ahead of your shoulders' range or even directly ahead of your ear by a foot or so (right ear for right hand, left for left). Basically, think about them entering the water at 11:30 and 12:30 at a clock rather than entering at 10:30 and 1:30 and needing to move underwater to where they want to be.
A good drill for this is the fingertip drag drill, where you drag your thumb up the side of your body on the recovery of each stroke. This helps people practice bending their elbows on the recovery, but it also helps put your arm on the direct line where you want it to enter (i.e., it'll pass your shoulder then enter a ways in front of it) so it gets the feel of the new entry point. Just watching where your hands enter as you swim can also go a long way on this one.
Overall, I like your stroke. I look forward to what others think and wish you the best in practice!