More of a Stoic Cynic, Anarchy Sounds Exhausting
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I'm doing that now though I feel our club numbers are low and will not have the desired impact.Why not pump the numbers for some US classes in and see? Large wings can just attract the same ratings hit as trapezes - there are three winged boats in the graph above and they fit the model quite well. Plugging the formula + trap and kite corrections + yardsticks into a multiple regression may at least give you a ballpark figure that will allow you to make other corrections.
The Australian and NZ yardsticks were created when there were lots of "skiff types". They aren't perfect, for the reasons you give, but they keep most people fairly happy; everyone knows that some boats cannot be beaten in some winds and others cannot win in other winds, and that's just the way it has to go.
Even with very similar boats, no yardstick system can work perfectly as well all know. Something like a Laser versus OK duel can just get down to how square the square run actually is. At least it's not like my job of trying to work out local modifications for an unusual sailing area with a fleet that includes two multiple world champs on foilers, windsurfers, wings, cats, trailerable yachts and Optimists.
If a club would like to have PY numbers I would be willing to transfer them to Sailwave and submit them as a shadow rating. This is something I wish USS had engaged in.