The resticted rule set does pretty well to keep this in check - even if they neglected to publish it on the site.

No one seemed to upset about canted boards. A curved one with the same inboard and outbord limits keep the thing virtually identical in net force. It is impossible to restrict the board to be on a hull centerline as you then have to write a rule about the shape a hull can be as there may not be a centerline on an asymetrical hull. If you cant a symetric hull and put the board in straight, they are in effect now canted. Straight foils canted foils and limited curved foils all produce some lift forces. This is why the technical committee removed the hydrofoil reference and in its place restricted the limits of the foils.

These boats have been measured and allowed to compete, so for the time being the argument is moot. There are several petitions being submitted to address this and it will go through the proper procedure to be voted on by the class and potentialy have the rules rewritten to address it.