Yaryar, on the outer cone of the variator there's usually a brass band that limits the distance the cone can travel. I've ground it off of grandes before and it didn't seem to make a difference, though I guess it would if one were to make modifications raising the maximum power output of the engine, thus forcing the variator to close farther...
Hmm, heavier weights, perhaps??
Polini evo, go big or go home:)
Vespas are gloriously frustrating and lovely!!!