YOu are really making progress! This was one of your best canter rounds ever. I only watched the video once because I didn't need to see it twice to find a bunch of stuff to comment on. YOu are getting much better at staying with the horse, and are beginning to be an active rider not a passenger. Much better.
You still tend to drive too much with your upper body, kind of throwing it back and forth like you are going to pump him into more energy. Since the upper body and the lower body move seperately horseback, you are moving your upper too much. Your lower must be freer to move more with the horse so that your upper can stay still.
YOu know how a hula dance has a perfectly still upper body while the lower is going to town? YOu need to hula a bit, here. (just my wierd example) But as you are cantering, think more of having an anchor in your core and you swing the horse for and back with your lower leg and pelvis. Of course, HE is doing the work but if you want to increase his energy , you think of bringing him up to you and in front of you, as if you are hanging from a monkey bar and swinging your lower body up and forward using your abs.
Bring him to you, push him forward and front of you (like squeezing toothpaste out) and you upper body rides like a Queen on top.