Nobody can ever bounce a serve 7' high at the backboard. Not Isner, not Dr.Ivo, not Battisone, not any of us.
Hot weather, abrasive court, TALL guy, maybe 4-5' up the backboard.
Now you can hit a rock or something on a court and do it, but that's not really a consistent bounce, is it?
Nice motion, you're getting old, lost some pop and some lift.