Hey Mike, you might want top check out this site here
http://boatsbikesboards.wordpress.com/

there's a lot of consolidation of tuning information for the Viper after hours and hours of 2 boat testing.

there is currently around 10 vipers at our sailing club and we love the boat. it's a really finely balanced machine and even millimetre adjustments on the wire tension etc makes tons of difference on the performance of the boat.