Every time you answer something, you create another question. Now I wonder what is the difference between registering as an F16 or an F16hp? According to your definition in the class rules, they are the same thing, so why is it better to register as F16?
2.1.1 The full name of the class is "Formula 16 class for High Performance Catamarans"; and her official abbreviations in order of preference are Formula 16, F16, Formula 16 HP and F16 HP."

I would think it would be better to register as F16hp, because eventually somebody might form a Formula 16 class for Low-Performance Catamarans.