Mike,
I'm not knocking the weight of the Viper at all, just saying that with better design and dedicated parts it could be on a par weight wise with many of the existing F16's.
Either by design or by commercial risk aversion ( using existing parts to limit development costs and thats exactly the right route to go in my opinion ) the Viper has fallen into a real sweet spot for its handicap, good and hope all the new owners will enjoy what is obviously a cool boat.
My guess is that should a new Nacra or Hobie suddenly appear thats 16ft long and down around the 120 kilos then AHPC would immediately issue upgraded components to lower the weight. Nothing wrong in that in my opinion just a MK2 version.