The guy from who I bought the sail, warned me about X9 masts. They seem to break easily. I guess that confirms the story of peterman.dk.
I've just rigged up the rs racing in my garden.
I've tried it with a unifiber 430 and with a tribord 460 mast and couldn't see much difference. On both masts the sail looks OK.
I'm still curious about the camber rotation because there was not much wind in my garden, so I had to push them over. I noticed that when they flip over, they all flip over together real fast, so I guess that's ok.
PS: I still remember that in february it was freezing cold. Respect, man.