You should be able to run at the maximum rpm for the engine you have., but not over that rpm with a clean hull and prop. And you should be able to attain hull speed or close to it. With your waterline of just over 24', your hull speed is about 6.5 knots. If you go to West by North Enterprises
, they have a lot of good information on choosing a prop and if you fill out the form on their site they will email back their recommendation.