Frenchie,

Does Bernoulli's principle, applied to foils, not depend on the difference in pressure between two surfaces? My understanding is that it's not simply a 'sucking' effect. I.E...the low pressure on the curved side of an airfoil is only a low pressure as defined by the higher (normal) pressure on the opposite, or typically flatter, side. In analyzing a hull going through the water, there is no opposite flat side with which to establish a greater or lesser pressure (not technically - but the air difference is so negligible). I think any hydrodynamic effect of the hull being drawn deeper into the water at higher speeds, however great it might be, is negligible in comparison to the moment applied by the sail plan to the leeward hull when the wind is honking.

For Reference: Phantastic Physics

And even then you just put a spinnaker on a pole out front and generate enough vertical lift to raise the bows out of the water!