Looks great nevertheless, kinda floating.
But anyway, when i was doing head-height jumps at home, i couldn't reach ceiling, so i used to hang a string with an object at the end ( e.g. a pencil ). Not only you know if you reached a height that way, but you can even quantify and regulate, you can estimate from the 'impact force' how much above the pencil you got so then you can shorten the hanging length of the string. So if you expect to get 2-3 inches below that ceiling, start with a 5'' string. See if you get it, estimate how much, and then shorten it to 3'' etc. Not that convenient but works well.