Thanks John/Steve, good comments.

Steve the problem with wanting to 'harass the bigger boats downwind' by using a kite is, they're all fitting kites too now and so eventually you'll end up back at square 1, but with a shirtload more rigging to do to sail in a class, even more fragmented than it already is. How many Mozzies are there racing with kites and how many are on the start line of any given race? I ask this because I think it's a mistake to be thinking about trying to go with the bigger boats. That sort of thinking is a legacy of a sport which is fragmented by too many classes. The various classes now have to race together simply to have a decent number of boats on the start line. In this situation you're trying to make a bad situation better by being competitive amongst bigger boats rather than concentrating on building numbers within your own class. Not good.
In an optimum situation there'd be enough boats in a class to demand their own start and race only with boats of similar performance, not a mixed fleet where the 16ftrs get creamed by the 20ftrs. Fitting spinnakers to smaller boats simply delays the time when there'd be enough boats of similar performance on the start line, by further fragmenting an already seriously fragmented fleet. Presently, you have a very limited number of Mozzies on the water and to make the situation worse, they're now racing in three classes. Not good.

The whole idea of developing the 14ft cat regatta concept is to consolidate by facilitating a group of classes with similar performance. Making one particular division within that class significantly superior is counterproductive.
Bern