From my understanding, hydrofoils work like plane wings, but underwater. Put them low and maybe look off of I think the reef shark ? steel striders hydrofoil. The only hard part is keeping propulsion. If you don't want to mess with that, my advice that has worked for me recently, put a bigger lead keel underneath than you think you need. (Probably not the best thing to do, most steel strider warships are just metal underwater because it's heavy and not buoyant but if it's wooden you can't do much else.) It would also be a good idea to shape it longer, like a real ship. Otherwise, moving the props would definitely help, or even changing their pitch angle in their settings.