Be wary of the SCHRS handicap in regards to light weight boats and single handers, the calculator does give some strange results, one only has to look at the present equal rating of the Uni and Sloop, on the water results would indicate otherwise.
If you get the chance try putting into the calculator the Uni's specs and then add a blade 2.5 sqm jib, gosh we would be the same speed around the course as a Tornado. Mmmmm