Wondering if my motor is set to low. 1990 v-200 merc, on 18' ranger 375v, with 5 1/2" jackplate. RPM's are about 5200-5300, just me with engine trimed up, with a laser ii 25p prop. center of prop shaft is at 10 1/2" vs. bottom of boat at 17". I think you can see all the measurements. I can move...