Good to see you're not striving for height at the expense of form now. I agree with the above comments and have a couple additional criticism, though fairly minor. dvcochran may have cryptically touched upon the first: There is a slight arc in some of the kicks that is most noticeable when you did it straight on into the camera, though I noticed it in the side view first.
You can see your left kicking knee position is slightly off to the right, causing your foot to travel a little horizontally to the right instead of perpendicular to your body axis, directly toward the target. This raises your foot to the left, causing a slight roundhouse kick effect. Knee position is critical to many kicks. It's slight as I said, but since you're looking for the "cleanest" kick, it's something to work on along with your chambering. Your foot should travel in a straight line from your supporting knee all the way to the target.
The other thing, I believe it's important (for me, critical) to keep your lead hand from dropping down. I like to keep my hands in the guard position throughout all kicks. allowing for defense or a quick follow-up jab or reverse punch. Overall, pretty clean. Next year it will be excellent.
