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Old 02-21-09, 09:19 AM
  #20  
Road Fan
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Bikes: 1980 Masi, 1984 Mondonico, 1984 Trek 610, 1980 Woodrup Giro, 2005 Mondonico Futura Leggera ELOS, 1967 PX10E, 1971 Peugeot UO-8

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Thomson posts are thinner on the sides than on the front and back, to stiffen it against in-plane bending caused by rider weight and road bumps. I don't know if this is done in carbon posts.

A high saddle causes pelvic rocking, which is in opposition to frame torque due to pedaling. With a very stiff BB and seat tube and a high saddle, I could see this net seat tube/seat post torque resulting in seatpost bending. I could see a lower saddle helping.
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