I do encounter the same problem too with my GyroDec MK IV.
Some of my vinyls aren't 100% flat and certainly not firmly attached onto the surface. What I do instead I place the felt washer on the top of record and then clamp.
Some of my vinyls aren't 100% flat and certainly not firmly attached onto the surface. What I do instead I place the felt washer on the top of record and then clamp.