I agree with Wayne that something needs to be changed in the box rules to make uni more competitive. I don't know what that is or if it is even possible.
The “box” rules already allow this, but somebody has to be willing to explore the possibilities.
Versatility is what is being promoted and the ability to run “heavier” crew weights without suffering against the other formula classes. Uni is a different animal as the crew weight is so small and sail trim limited. Realistically less hull volume and for sure less sail area would be a big plus in fitting a boat to the lighter crew combo. Who wants to be that guy with the small main sail?
From my view, the current configuration winds under 7-8 and uni, the uni guys have a huge advantage. They have a giant power to weight advantage over the sloop, and the only way it even begins to be accounted for is the added ability to keep in trim with 4 hands. Is the uni sailor going to be willing to give that up to be in more control in all the rest of the conditions?