I bought a OS 75 AX engine and a 3 bladed prop. The propeller is one inch shorter than the recommended biggest size two blade. This is the first time I've ever used a 3 bladed prop. What I noticed is the RPM reads 8,500 at max throttle. I expect that the engine would get around 11,000 with the two bladed prop. Does the increase thrust of a 3 bladed make up for the decrease in rpm?