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The blade and viper are F16 and seem to need the kite to work there magic

Richard, can you elaborate on this comment ? Do you mean those boat are not as good without a kite ?

They seem to need the kite to get downwind fast,I can only speak for sailing against the blade,not sure on the viper but with them sharing the same theorys it could be case.As for going to windward they all seem to have the same boat speed,I think it's the beam width on the boats that could make them different I always think it's the nut holding the tiller that makes them go
Just my 2 cents worth
Richard