In the end, a good tennis player will always beat a great mathematician at the game of tennis, as played on a tennis court.
The math guy will when lots of arguments, and lots of logic debates.
But the tennis player wins on the court.
If you need 70% of your first serves to go IN during a match for you to win, you are a pusher with no big first serves.
If you can win at your level with a 40 % first serve, either your first serve is GREAT, or your second serve is basically hard to attack....or both.