For people that have never drag raced or had an engine on A dyno this may get some gray cells moving.
An engine may be able to pull 10,000 rpm but the dyno may show you that it's time to shift at 8,000 where the peak torque is and you will get better times.
Just A thought about RPMs.
Just for grins toss on an APC 11X4 and see how you like it.
For racing the 10X8 APC seems to be the number one choice for that engine at my old club. For sport flying I have always used the APC 11X4 to 11X8 on that and other .46 engines with the 11X6 or 5 my number one choice.
My advanced instructor was A man that liked to find that perfect prop for each of his planes and it sort of stuck to me too. I spend A lot of time changing props on A new plane until it does what I like.