Very confused here, sick of the punishment of a aluminum seatpost in my CAAD 8 so I went out to the garage this morning to change it out. I have 2 other 27.2 carbon posts from other frames so i decided to stick one in. Neither will fit, I mean they go in, but not without A LOT of effort, and I can't get either of them in farther than a couple cm. I slid the carbon wrapped aluminum post back in, it goes in fairly easily, does take a tiny bit of pressure. What is going on here? I cleaned out the seattube before trying, could the carbon posts be slightly swollen from the high humidity here?