RE: MM Gooseneck/Vang ofr RG65
My RG65 is a Blue Splash with a flat deck. When I first built it, I set it up with vang above the boom. When I made new sails, I put the vang below, and I like the look better. If you sail in stronger winds, using vang high will give an angle to the boom which could keep the boom from draging the water.