Hi bcoak,
Some thoughts seeing that I know what you have been working on ...
Mostly, you do a pretty good job!
Ignore the head movement suggestions....you keep your sternum very stable, and that is what is most important - to keep it steady/rotating still in space,
I see some adding in the impact area....some handle dragging/some right hand, and definitely you add some acceleration on some putts(especially in the first video).
You have to commit to the quiet hands through the impact area. To help this, make sure the left shoulder does not pull through(it did on some strokes). If your shoulder works decently, I think you can develop the trust that the putter will swing on line through the strike.
I think you have the knowledge about delivery speed. Commit to it again. On those short ones, don't sweat if there is a little more speed as long as,
a) you make a bigger stroke rather than adding a hit at the bottom,
b) maintain your rhythm
I realize that you just let the video run, but if that is how you typically practise, I would change it up...
You look slack in your aiming routine, and that a little left/a little right aim translates into a little push/pull or a little more acceleration/deceleration to find the hole.
Instead, put a tee in the low side of the front of the cup and work the ball into the hole monitoring delivery speed(1), your rhythm(2), your stroke mechanics in the downstroke(3), your ability to let go of the result(4)....in that order of importance.
With respect to the yips, I believe that there are mainly two types - Speed yips, and rotational yips. Focusing on dystonia as a possibility removes control from you, and has not been proven by Mayo or anyone else(read the follow up stories!)
Focus on the movements that you know you need to for both. We all get tied up thinking about the results from time to time. Prove to yourself that the various skills work, and then trust that they will do the best job possible.
I had them bad about fifteen years ago, and it did not take a year to get rid of them. I flinched on less and less each year, and now don't feel there is any chance of ever having them again(how is that as a challenge to the golf gods?)