RE: OS AX 46 needs more power
The OS AX .46 is faster the OS FX .46, well documented in our area as we have been racing those motors for somewhere around 15 years.
Ignore your RPM / PITCH calculations, I won a ton of races using a standard APC 10x7 Sport Prop.
A couple of the APC pylon props do work, I believe many of them are using the 9 1/2" x 8.5 N (Single N, not double NN).
Good luck.