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Keep what you have. But define what you mean by "more power". If you want more SPEED you need a prop with more pitch. That means the motor draws more current (and likely a lot more) which shortens run time. If y0u really want more push, you need a prop with less pitch -- which means the motor needs to run faster to keep the same speed as before. Keep in mind electric motors have a design speed meaning they will only turn as fast as the design permits. That means a prop with less pitch may not provide any improvement and may actually hurt performance. Minnkota designed the prop for that motor (all of their motors) for a compromise of current draw and thrust. You cannot change one aspect without affecting the other.
