Since we aren't privy as to what is out of adjustment on your engine, I will offer this advice. Get a service manual, preferably a factory one, to explain the throttle and spark advance relationship and setup/adjustment. Youtube, while wonderful, can offer some questionable examples regarding adjustment advice
Don't be overly concerned about engine height, at the speeds you expect to see. Even, with the hull bottom or even 1/2" below is fine. Engine trim will affect rpms if the boat is nose down plowing water