You should be able to get to rated RPM (on my continental IO-240 it is 2800RPM) so the 2400 RPM you are seeing with full power level flight is too low, you should be seeing more like 2750 which I believe is the rated limit on the O-200. Keep playing with the pitch till you can achieve this. My full power static RPM is about 2350 RPM and rated RPM of 2800 is achievable at full power level flight. I have a Sensenich wood prop . Bruce N199CL