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@M_V
A vernier will only really tell you what the top of the seat tube has been squeezed to.
I've had a few frames that have had this issue. My advice would be to clean the seatube out as much as possible. Use something like gt85 and rags rammed down inside the seatube to dissolve and remove any crud, old grease, corrosion etc and then try the 27.2 again.
Also, I'd advise trying a few different posts, the higher quality the better as I've found large descrepancies in cheap posts.