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Yeah, I got conflicting messages from the collected wisdom of the internets as to whether or not reaming the shim was necessary. It didn't seem necessary before I glued the shim in place, but it was after I'd glued it in place, so I may have fitted it slightly off-centre. Lots of filing and sanding has made it work. The seat post is definitely straight, as I checked it.
Brommers
edscoble
The seatpost shim need to be reamed after fitting and gluing it in before fitting a seatpost in.
Also check your seatpost as it could be bent ever so slightly which can make a massive difference in being able to drop the pose without any stuttering.