Hello,
I regularly read this forum, but this is my first intervention to share my experience.
You can see on this graph the engine RPM on the ground and during the flight with a Mejzlik 22 x 10 :
6350 RPM on ground and more than 7300 during the flight. Is it too much ?
My engine is an FG 60-R3 on which I moved the magnets of the original propeller hub to have 30 degrees BTCD on each cylinder