Keith,
A boat being incorrectly rated by US Sailing can only happen if and when racw committes do not turn race results in. Race committes ,Please turn all ET race results to Darline Hobock. They can be sent by e mail. All it takes is a couple of clicks on the computer.
I think you are right on the 17's PN. I sailed one for the first time in 15 years at the Tradewinds this year. The boat sailed to a 70 not using the spinnaker. Darline has this data. Let's all be good race results reporters.
Bill