RE: Light but Durable lightwind Cam sail - does it exist?
The ezzy sails do look heavy, but they use thinner monofilm between the reinforcements, so they aren't quite as heavy as it looks. Don't know about it's power i have never sailed a 9.5 infinity, did sail a 7.5 though, seemed to work nicely.
You can also have your sail repaired, but for big sizes i don't know if it's worth it, because you have to change the whole ''window'', which is big, so it costs a lot.
Hope this helps