I've got a Mac 19 with a tohatsu 40, 11.2 diam prop and 12.5 pitch. It labors hard with more than 3 people. Never gets on a plane even though we've tried several different tilt settings. This boat teeters from medium to heavy according to www.tohatsu.com/tech_info/prop1.html Has anyone done some experimenting with different props? Does anyone know what the stock prop Macgregor originally sold with this set up?