I have a 2004 yamaha f60 on a yamaha G3 boat 17ft, and the rpms top out at 5000. I understand it should be around 5500-5600. The boat weighs 1150 lbs. Is this thing set only at 5000 rpms because of the weight? Or should I do something to get higher rpms. I figured since G3 is a yamaha boat company they know what they're doing. But I also know from boat tests on they're web site that the extra 5 to 6 hundred rpms can get an extra 5 miles in speed. Since I'm only going 29 mph tops that's a big difference