We are not the only ones running into the same problems of the Uni sail, have a look at http://www.catsailor.com/forums/ubbthreads.php?ubb=showflat&Number=226685&page=1. Here is a very foward thinking guy who is giving what is probably a hunch, a go. Matt may want to answer on this one as I'm pretty sure he knows a fair bit about this having sold Randy the A in question.

It would be very easy for the F16's to fit a small blade jib, we all have spinnaker poles and lower bridles to lock in the lower tack and just move over to having 2 front stays as per the A set up. On Bitsa I had a ferrule compressed on the stay wire about 1.5m down from the tang and then put a piece of D12 across between the stays to pull the top of the stays together to clear the top of the spinny, it works well. Use very small 2.5mm stays and the aerodynamic drag would be much the same.

Its not the size of the jib, its the jib slot effect and ease of setting the main with that jib slot, which makes the difference.