I have a 21' Bayliner Trophy, I replaced the Force 125 with an Evinrude 150, (1989), When I put it in the water I found that it will not go over 3500 RPM, and takes about 15 seconds to get there, (bogging). I am thinking the prop is to aggressive. The prop on it is a 15 x 17 x 3 as read off the...