No one could critique you as hard or as well as you did yourself. I think you ride pretty well. You're just tense there, and out of shape in the muslces you need to bemore stable. Yeah , hands need to be quieter but you know, once you can ride more, that will all fall in place, even the canter. You are just worried and tense and not flowing With the horse.
Not to worry, you have a great base and will be doing so well once you have the muscles to support you.
What was the music iwth that video? I liked it.