The biggest issue is ball speed is measured at release. So when we hear on TV that so and so just let one rip at 25 MPH, like Tommy Jones has been known to do, reality is a lot different at the pins. Most centers have the cameras set down lane beyond 40', where the speed is the slowest. Not to mention those can be very inaccurate. Studies have shown release speed of 18-21MPH to be ideal. How fast is too fast? When it consistently has a negative impact on accuracy.
Your guesses are probably accurate. Most amatuer, modern era bowlers, have some muscling of the swing.
As you can see even modest rev rate players need speed. Ball selection and layouts are pivotal for anyone that is not balanced.
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