asdasd : you seems too stiffy at the boom, and for the second replay i think the way how you boom uke looks ugly, you need more range to get a better boom action.
Boom tips : shift+p: relax your ankle with the leg you're kicking uke with. And check which leg is this: example: it's the right leg, I should rotate the chest to right so it will make the kick more powerful: Try that.
Note: your leg should enter uke's joints so you can make the boom.