That big move you make that MyBoyPuck mentioned is because you have a chair seat :( as a result, your body needs to make a big move to get over your foot so you are in balance. In another thread, someone mentioned "double posting." It would be a good thing for you to experiment with.
Mostly your riding is really solid. I saw what you meant about rocking your shoulders in the first video, but it was not even an issue in the other videos, so it looks like you fixed that already. If you want some additional input try to get a better video. These were kind of all over the place. With a rider as good as you, a critic needs a better quality video so that the little details can be assessed, because that's what you are down to at this point - fixing subtle details. Nice work.