Or should i try to get 20 mph like Belmo?
That depends, Have you calculated your "Rudy Numbers"?
The Rudy Numbers are your Release Strength and Release Energy numbers.
Release strength is related to the Rev Rate and the balls Radius of Gyration (RG).
It takes more strength in a release to get a high Rev Rate. It also takes more strength in a release to rotate a higher RG ball.
So, the Rudy Strength Number is:
"Rudy Strength" = (Rev Rate * RGN) / 500
Note: RGN = "Normalized" RG
The Rudy Strength Number ranges from zero to 10.
Next the Rudy Energy Number is related to the total energy given to the ball by the bowler during the release.
So, the Rudy Energy Number is:
"Rudy Energy" = (Rev Rate * RGN * BS) / 500
Note: BS is ball speed ( some bowlers have too much BS).
The Rudy Energy Number ranges from zero to about 250 (assuming there is someone out there that rolls the ball at 25 mph).