I need some advice from one of you prop experts:<br /><br />I have a 19' deckboat with a Johnson 140 hp 4-stroke.<br /><br />Currently has a Johnson prop, 14 X 21". The prop is slightly dinged. <br /><br />When loaded with just 2 people and 1/4 tank of gas, top speed at WOT of 40mph at 6100...