I have a 1996 sailfish 17'6" center console I just put on a 1999 Yamaha ox66 150 motor, I am running a 17 pitch prop stainless. At wot i get 45 at 5200. Now I am content with speed but i have to much bottom end power and my cruising speed is around 35 mph is at 4100-4300 rpm. shouldnt I be able...