I'm sorry, now I see, you want to race your F14 in a mixed fleet for overall placings on yardstick within the whole fleet against all comers. In Australia we run 14ft only regattas and within those you either race for line honours (F14), or to existing one design yardstick places. Generally Formula class boats F16, F18, race as a class and not for overall line honours against all comers.
I'd say, given that my 430 without a kite runs with tail end H16's, that the H16 number would be somewhere about right when fitted with a kite. Just my opinion.
Bern