I notice a couple things, though I'm no expert. Your X step is okay, I don't go backwards into it, I do it sideways. Idk if that's something, but I could see you hurting your knee by having your first step that steps over. Picture the teepad is a clock. 12 being the front of the tee pad. Your first small step is 12 oclock, your second step that you turn your body with, your step is at like 7-8 oclock. Which causes your back foot to twist which makes an awkward movement for your knees and probably hinders your momentum.
I question your pull through, but I've been having trouble with mine, so I can't comment on that as someone else could. I like your follow through though. I like you switching hands on the hyzer and holding it up haha.