Okay so I have an 89' mercury 9.9 pushing my 15.5 foot alumninum v-hull. The rubber bushing started slipping then went out completly. The alumninum 3 blade prop that was on it was a 12 pitch( I think) that was the only number that I could find. The prop was torn up pretty bad so I need a new one. I run in shallow water a lot! The boat weighs approximently 400 to 500 pounds just guessing though. The boat has never been very fast and it only planes with one person sometimes and even then it takes forever. What prop would yall recommend for me?