I have a 2001 Pathfinder 1900v bayboat with an f115 yamaha and a stiletto 13 1/4 x 17 prop on it. I get good speed at wot around 42 mph. However, my rpms are at 55-5600. I am not really interested in more speed, but I have read that those 4 strokes prefer 6000 rpms at wot. Would I get that if I...