I use a short seat post length, given my frame dimensions, i don't need a longer one, and this just tends to be a recurring problem for me. if the liquid torque doesn't work, i'm just gonna go thompson. and yes, it is the right sized seatpost, 27.2, measured a while ago. not sure if it's a common problem for others, but it has been for me, the ti post in addition to slowly sliding down had trouble clamping my saddle correctly, so i went carbon, sliding is again an issue. and i'm not talking copulation type motion, i'm just talking like 1-2mm per ride. which actually is pretty significant after a ride or two to change my fit, i actually noticed the sliding with the carbon post because i was starting to get a pain behind my knee and had thought i had my fit dialed in just right! (i did, but didn't realize it was still sliding into the seat tube when i switched to carbon).

thanks again for your input.