Not sure if this is much help to you but I tried a 4 blade 10 pitch on the same motor you have and ended up going back with a 3 blade. The top end difference was far more than the holeshot leaning towards the good for the 3 blade. I also thought that when you go to a 4 blade then you should go up a pitch from the factory 9 pitch 3 blade. I could be wrong but that is the information I was given at the time.. Hope this helps a little. Also, it may be cheaper to purchase an aluminum one of the same blade and pitch to experiment before purchasing the more expensive stainless. I was able to buy two for around $100, kept the one I want for a spare and sell the other for around $40 so I was not out a lot of money and had the prop I needed but just a lot better being stainless....