I have a 1984 thundercraft 160 magnum 15.7 ft trihull with a 75 evinrude 85 on it.the boat weighs 700lbs dry I carry 15 gallons of gas and about 500-700lbs in gear max. Looking for ideas on a prop for max speed.it has no power trim or tilt.I will be pulling tubers with 2 200 lb people on board...