I think raising a C board would make the nose dive more not less. Raising the boards in the strong wind reduces healing moment, but gets rid of the bow lifting that the curved boards were giving.
When you put a lot of pressure on the bows and they start to get deeper in the water to resist that pressure, those C-boards that previously had a positive angle of attack and were providing lift, are now providing a diving force. They actually force the bows to go deeper and the pitch poll (or stuffing) more severe.
In other words, when they stop being part of the solution, they become part of the problem REALLY fast!
