If I had to change one thing, to make the Uni more competitive, it would be to add the jib. It costs nothing, you already have one in your box, you already have the self tacker, and it's really easy to trim, even single handed.

Sometimes it gets in the way, mostly at the A mark, when you now have to ease the jib, and the track, and the halyard, in addtion to all the other 'crew duties' you have to take care of: hoist and trim the spinnaker/main sheet/traveler/boards/rotator/downhaul strings you have to pull. The jib adds three more strings to pull, both at A and C mark, but going up wind in medium air, you should be able to pass most 2 up Sloops, depending on total crew wt. on each boat.

Now...if you go out alone, with your jib, in say 8knt winds...and an hour later it's blowing 17, you may wish you left it in the box!