Have these two been discussed together here

When you vang the board upwind in lightish airs the lee rail sinks deeper than the interface. As the board goes faster, you vang the board less and the wings ride on top of the interface.
So more planform curve in low S/L, less in higher. More leeway resistance in lighter air, less in heavier? Does Paradox only exploit part of the effect? Does Paradox need the rail farther forward because she has no DB, and a big rudder? And since a big skeg is not that great at speed on a windsurfer off the wind with the CB retracted and the CLR moved back, leeway resistance from the rails is really only needed when the CB is deployed and the back end of the board needs some leeway resistance to help the small skeg. Which seems to me exploiting the same principle as Paradox but reversed longitudinally because of blade placement.