Can not vote, so I'll post Viper.

I would be carefull when discussing 'Optimised F16' The Viper could be lighter but also ticks the right boxes in other areas to make up for it's weight over the other F16s. Pretty quick also for a 'heavyweight' if you look at the F16 results. As far as I am concerned, there has not been an optimised F16 built yet. Still plenty of pace to squeeze out of the box rule.

What I would really lke is a full carbon Viper down to min weight.