I seem to have the dreaded seatpost slip 'issue'. Twice now I've tried the bike on the turbo and at around 40mins the post started to creep down. I've used a torque wrench and liberal amounts of carbon paste. The bolt seemed to work loose a bit - not sure whether that is an issue with the bolt itself or the post slipping that causes the bolt to undo. I think part of the problem is the design of the clamp which just seems to pinch the seatpost at the front to create friction with the back of the seattube. I had stickers on the seatpost side which marked its theoretical height after measuring my old bike. When the post slid down those stickers did not move from where they were applied which suggests the post isn't actually that tight on the sides of the seat tube. Any suggestions anybody? I thought maybe wrap some thin duct tape around the post - this worked on an old mountain bike with the same problem but the frame/post were aluminium.