If you are running a 3 blade currently and not getting the hole shot, you could consider going to a 4 or 5 blade of the same pitch. I would not go lower than a 17 pitch due to danger of over-revving the engine. We boat at 6200' with a 2015 Sport 190, 4.3 L Mercruiser stern drive, and started with a 3 blade 21 SS. Changed to a 5 blade 19 SS and noticed a lot more hole shot power. Still would like to have more but I don't want to push the over-revving issue. I suggest going to the Mercruiser website and using their Propfinder feature. Plug in your engine details and altitude, and use the lowest pitch they suggest on a SS 5 blade.