looking for input, presently, 87" 48 spl, compression down from 145+ to 125 over 6 years, got a line on a 2013 40 Yamaha, with 120 hours, how would they compare power wise, at present runs about 20mph at 4300 to 4500, Yamaha has a much smaller prop, looks like a evinrude 25 or 35 prop. this...