Not sure about the temperature difference, but it's also a good thought. I do know that carbon posts can creak, and can only imagine that carbon seat rails and a carbon post could only make the surface area larger and much more noisey. While I personally own a couple of bikes with carbon posts, I've never heard any noise issues... but I've always used the carbon paste.
Good luck to everyone and definitely keep us posted!
Ridebikeme
http://chasecyclery.blogspot.com




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