Geelong Regatta seemed to be sailed under the published rules and Regs - end of story....
Extra breeze - Nothing wrong with getting an extra mate (or three) on board every now and then....

May not be as cool as having multiple sets of sails ......

but achieves the same aim ..... and is a bit cheaper too.
Shaw-650, great to hear you're impressed with the boat. The Shaw 650 is obviously a very competitive design and good to see the Viper and Shaw having good racing on the west and east coast now.
Both boats are very different design concepts:
- The Viper is an affordable strict One Design, that can race competitively on SMS.
- and the Shaw, also highly competitive on SMS, has more design and build options.
Great to see both classes and concepts prospering here and overseas.
(If you're OS and wondering ... Historic Australia 18' Skiffs.... )