I have a Razor 4XL leftover from my old boat and wanted to try it on my new SHO. When I mounted it up with the hub kit there was a larger gap between the inner diameter of the lower unit and the outer diameter lip of the prop. It seemed to have the right depth into the lower unit compared to the stock prop but the gap looked too big. Guessing that means I would need a cavitation ring or would it be ok to run that way?