Wedge seat post clamp cracking a carbon fiber seat post

Has anyone had an issue with a wedge seat post clamp cracking a Fizik Cyrano seat post. I have never exceeded the recommended 6NM torque and I have full confidence in the bike shop mechanic. So I suspect the cracking my be from occasionally riding paved roads with intense pot holes??? Are there carbon seat posts that are designed specifically for wedge clamps?

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