Hi Sparky,
The wind force from a mast/sail/rig leaning to leeward at the top tends to push any hull deeper into the water, canted or not.
You don't have to cant the hull to cant the board. You can have canted boards and vertical hulls but as noted on Cogito, the windward board is always raised. On Cogito each board is the proper size to generate the side force to balance the sail side force. This results in a very high aspect ratio board which has a higher lift to drag ratio, which means less drag, than two boards half as deep.
Cogito will always use the leeward board to generate lift because of the asymmetric shape, Again the asymmetric board shape has a higher lift to drag ratio than a symmetric shape but only when loaded from the correct/proper direction. The flatter side of a foil is the high pressure side and the more curved side is the low pressure side, just like an airplane wing.
Bill