Over here we always set our engine to begin with where the centerline of the prop shaft is 3.5" below the bottom center of the hull and adjust up until your water pressure drops. Next you mark your spot on the mounting bracket and drop the motor in 1/4" increments until the water pressur comes back up then you are set. I have mine set a 2.75" below the hull, for every 1/2" lower it looses around 200 rpm. The difference from the factory setting and where it is now in night and day. I gained around 6mph at WOT and cut the time to plane down by close to two seconds. It also eliminated most of the chine walk at high speed and most of the bouncing at low speed.

Stumpy