IMO you move well but at the same time you look timid... like if you weren't able to project intent both offensively and defensively. Don't know how to explain better.
Yes I agree. I think a reason is you haven't developed a center. Your upper body is stiff but all you posture is sloppy. You are collapsing into yourself. I'd suggest to practice a lot of weapons regularly.
Other suggestion would be as a uke to push your center constantly toward nage center to create a continued pression on his structure in any moment of the technique. You shoul do it by constantly bending your knees and use big muscles of the legs, make sure you can freely move your shoulders in any direction anytime.
Mentally you seems to be afraid by a nage.....there is any reason?