Explain to me what your consider optimal performance? That boats should run no more 23 mph. No porpoising. And raising the motor up two inches would help much on preventing hitting things in shallow water. Just think, once on plane in that boat, your drawing minimal water on the transom, none at the bow. You get within two inches of the gearcase with a stump, you'll find a higher one in just a second that will throw you out of the boat.

No porpoising at WOT, highest point of recommending RPMS, and top speeds around 23MPH, that will be optimal performance for that boat.