This may not be the best forum to ask jackplate questions.
Maybe a bass forum would be better.
So, your boat goes 62 mph and that's not fast enough for you?
I don't know much about them, but with only 4" of vertical travel.
I'd say to start with the thing as high as possible and record the speed.
Then, move it down 1" at at time and record the speed.
Once you get the best inch speed, you may be able to tweak it up or down a little.
You may not have considered this, but this thing may slow down your boat too.