Having a time with my new to me ranger 118cwith 150 merc. 4stroke 150hp. it has a hyd. jack plate. do I raise plate till I get about 3.25 diff. dealer said just put plat all theway down and go. Prop is 21p Revoultion 4 Thanks buddy has excat same boat and engine but no plate ,same prop and good hole shot anf speed. I cant get on plane and pegs rpm 5800 plus at only 50 mph.Once again Thanks