SLX seat tube ID

[Derosid]

Did Columbus SLX tubing come with an ID of 27.0mm? I have a De Rosa frame built with Columbus SLX tubing that I bought in 1992. Back then I assumed the it would take a 27.2mm seatpost like my previous SL tube bikes, but it was always super tight. I had to hone it slightly to even get the 27.2 seatpost to insert, and it’s always been difficult to get the seatpost out.

I just tried inserting a 27.2mm carbon fiber seat post and it started scratching up the carbon, so I measured the ID and it is just a hair under 27mm and is not out of round. Have I had the wrong size seat post all these years?