You are close to having it. You do need a smaller prop with higher rpm,usually. The smaller prop is usually called for to avoid overheating and burning out the motor . Also the magnets on the BL motor will demagnetize if run too hot for very long. A smaller prop does not always make the boat more stable. Actually there is more efficiency in the bigger props. That is why many boats used to use gear drives ,so they could use bigger props. This can be also carried too far and not produce more speed. Now with very powerful BL motors all this has changed. n.h.schmidt