Join Date: Apr 2010
Location: Sunnyvale, CA USA
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You're not going to flex a seat post enough to absorb any shock (it's mostly loaded in compression).
A saddle with more flexible mounting can soak up vibration (I love my Selle Italia Turbomatic 3 which has the rails surrounded by elastomer where they meet the saddle). You might find a used or NOS example on E-bay)
Bigger tires can run at lower pressures without pinch flats (While 23mm tires were fine when I weighed 145 pounds, at 205 the 25mm are definitely nicer. 28mm tires fit my road bike (Litespeed Natchez, Campagnolo dual pivot brakes) too although I haven't tried any apart from the cross tires I used for winter commuting on bad days.