I have a 17 foot 7 inch modified V aluminum hull. It came with a 10 1/4 x 14 prop. I have ran the info through the Michigan Wheel prop selector as an up to 17 foot boat and as a 17 to 19 foot boat. I come up with multiple choices for prop sizing, but none for the prop I have. The issue I have is having low engine RPM and the boat doesn't seem to plane out no matter what I trim it out at. Can someone please make a recommendation on prop size?