At my club, the single handers often race with the jib on as well, it does equalise things up a bit, perhaps we could make the jib optional for the single handers ?
In open class racing the choice to do so is left to the owner. In class racing we already have a sufficient solution, i.e. we race first in wins (no faster handicap for the singlehander) which in my opinion is fair.
Wouter