Hi, owner of a 1988 chapperal 204 W/A. Orginally powered by a 1988 Evinrude 175 hp w/ an aluminum prop 14x19. I believe my WOT then was approx 4800rpm w/ a speed of 39mph. This year replaced that engine w/ a 1994 Evinrude 175 hp w/ a SS prop 15x17. WOT is now 4600rpm. Boat weight dry is...