It amazes me that an F18 sailor, who already races with minimum crew weights in that class, is considering an alternative class, but wants to drag rules across from their existing class! WHY!? You are already in the class that has what you consider the most important rule! Why do you need to change the rules of another class closer to the class you are already in?
The only thing I can think of is that you don't like the class you are already in! So two questions need to be asked; why do you want to change our class into the class you don't like; and why don't you like the existing class? It can't be because you hate the minimum crew weight rule you already have because you want that to come over to your new ride.
And yes, 135kg on an F16 will be perfect for most conditions whereas 90kg 2-up crew will be pressed in a breeze (not to mention a bit hungry). Don't forget, this is sailing, it is heavily influenced by nature hence unfair. That's one thing that makes sailing a great past time, it is always a challenge for perfection, and when you achieve close to perfection, it feels amazing! Stop trying to level the playing field, it can never be achieved, tall basketball players will always have a natural advantage over short ones.