http://www.cyclingmurcia.com/fizik-cyrano-carbon-seat-post-long-term-review/
tl;dr: guy over torques seat clamp, snaps seat post - you'll never guess what happened next
Or more specifically over torques then admits to leaving it permanently under torqued.
He doesn't overtorque it. He says it was under-torqued and 4Nm isn't going to deform the post though is it unless the post is shit. If it was undertorqued and not slipping it should be fine.
@deleted started
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tl;dr: guy over torques seat clamp, snaps seat post - you'll never guess what happened next