Does your frame have carbon seat stays? If not, a carbon post might help. I have had positive feed back from a number of end users who have bought the 30 or 40mm offset Aerus posts. Unfortunately not all carbon posts are created equal. Some are just carbon wrapped around an alloy post. Other manufacturers are not using the full potential of the material.
Perhaps going with lower tire pressure, higher TPI, tubulars, bigger clincher tires or saddle will get you more bang for the buck in terms of comfort than a carbon post.