I played around with your kick a bit and got: a boom.
My secret: All I did was basically just following pusga's tutorial.
1. I tried to get a little bit closer to Uke so that, by using the speed of the kick, I could "teleport" my foot into Uke's chest (you can see that by watching the replay tapping shift+p, in the frame before Uke's joints dismember my foot is in Ukes chest)
2. I placed it exactly in the joint-triangle: chest - left pec - right pec
3. At the end you sometimes just have to play around with the joints to put the maximum force into the kick/ to place the kick perfectly. Even using the neck can help.