Have you put a minimal smear of grease around the inside of the clamp (and it goes without saying, also the threads/under the head of the clamp bolt).
This should help it achieve the requisite torque... but don't overdo it.
@BringMeMyFix started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Have you put a minimal smear of grease around the inside of the clamp (and it goes without saying, also the threads/under the head of the clamp bolt).
This should help it achieve the requisite torque... but don't overdo it.