You should most likely have your jack plate set up at a hieght that gives you the best of both hole shot/how fast it gets up on plain, and top end speed you could possibly gain. If you do not have a hydraulic jack plate you should take some time to play with it and get it adjusted correctly. You should have it low enough in the water so that you do not turn excessive rpms (definitely try not to exceed the recommended max rpms for your motor) during your hole shot or cause your water pressure to drop because there isn't enough motor in the water. However, you should try to get it high enough that you can decrease cavitation by being able to keep the motor trimmed down some while cruising and at the same time increase fuel economy because you have less motor in the water causing less drag.
Every engine, boat, jack plate combo will have different heights that are optimal for the setup and everyone will have different opinions on where it should be set. The best thing I can tell you is play with different heights yourself and see what the best height is for your rig.
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