I just purchased a 1992 Glasstream 17V Fish and Ski. The boat has a 98 115 Fast Strike Johnson with a 6" manual jackplate, also a 13.5x22P Raker prop. The boat gets on plane very fast and tops out at 53mph @ 5900 rpm or so. The propshaft is set at 7.5" below the pad of the boat, which seems to...