Hi Brion,
Sorry to dig up an old thread but I'm reading all your advice because I'm researching a rerig for my C&C. I'm in the Seattle area, so I'll give you a call, but wanted to ask about a comment you made here:
"These boats are peppy enough to notice the difference between rod and wire"
Does that advice apply to Dyform too? Navtec's specs page seems to say Dyform is nearly as low stretch as rod:
http://www.navtecriggingsolutions.com/rigging.html
For -10 rod, the equivalent Dyform would be 7mm, which has nearly the same stretch rating. Or is there something I'm missing, like perhaps in practice (real world conditions), Dyform stretches more than rod, or the rating on that webpage is inaccurate?