To the OP:
As far as I can find, the torque range for the Campy Seatpost Clamp is between 4 and 6.8NM (36-60 in-lbs). So the carbon seatpost should be able to withstand being tightened within that range....but it is best to tighten only until there is no slipping up and down or side to side. The seat rail clamp torque value for Campy seatposts is 22NM (124 in-lbs).
-j