Originally Posted by
Oldguyonoldbike
My aluminum cx bike with the stock aluminum seatpost was really beating me up. I replaced the post with a relatively inexpensive (Tifosi) post and the ride is noticeably more comfortable (about 12cm showing, 31.7 post w/25mm setback).
You should try a smaller diameter post with a shim. The precision shims are easy to find. That should be even better.