Canted hulls are used on the A2 at 7.5' wide and use 7 degrees. I am pretty sure the 8.5' wide N20 is canted at 4 degrees. I have been led to believe that the canted hulls are done so that at ideal state with one hull just out of the water, the leeward daggeboard and hull are vertical.
Then the answer to your question would be that at 10' wide or 12' wide, the amount of canting would be less that at 8.5' wide.