I have a 31 hp mud buddy hyperdrive and the prop is only measuring 10 inches and is supposed to be 11. My boat will plane and run 5 mph faster in shallow water and throw a good rooster tail. I am pretty sure the prop is the cause for the slow speeds in deep water the rooster tail is weak in deep water also . I have heard a few different things about prop selection. Should I go with the stock prop at 11 x 10 or move to a bigger prop?

Unless your motor is modded or you have an EXTREMELY light boat and run lightly loaded all the time, you should probably go back with the same prop.