2 degrees might be too much. It would give the builder a possibility to make the bottom about 13mm (1/2 inch) wider or narrower than the top in the highest parts of the hull. I am not sure we want that and i do not think boats are built close to that. I want max 1 degree.
Maybe 2 degrees would be fine if we also set the wide different up and down to max 1/4 inch