I have a 1988 Slickcraft 237SS cuddy with a 5.0 and Alpha one outdrive. It is equipped with a 19" stainless 3 blade prop. The prop shop said it was a Vengeance when it was balanced. The boat runs fantastic with a top speed of 35 maybe 38 with a wind pushing me, rpm 4000 - 4200. I am looking for...