Matt,
I sail my Nacra 5.2 solo with uni-rig alot. It sails just as well with or without the jib. I usually sail it uni-rig if I am by myself and the wind is over 10 knots, mainly because I am lazy, but also to reduce sail area. I don't know how the Prindle would handle uni-rigged in more wind. The Nacra has daggerboards so they help alot with tacking. I know the H16 would probably be a nightmare without the jib in heavy wind. You would have to jibe 270 degrees each time. If you are not racing, it would probably be a better way to sail solo in heavy wind.

-Rob V.
Panama City
Nacra 5.2