I haven't tried yet, but from what I can tell, it's wayy to weak. I can tell by the speed of the overhead spin, it's hardly enough power to get a decap. It might potentially work, but try to aim for the neck. Even if you do get the decap, it wouldn't look very good.
Also, I noticed that you did not move a single joint in mid-air. This cause it to look stiff and such.