1997 Evinrude 115 V-4. My original prop was 14 X19-(not Evinrude- probably Michigan Wheel). Recently had to replace this prop and purchased a new BRP/OMC prop. The gentleman who sold me the prop said OMC doesn't make a 14 X 19 prop and the closest is 13.2 X 19. Anyway, with this new prop my top WOT went down from 5400 to 4000 which is a substantial drop!! Where do I start to troubleshoot? Thanks.