Recommendations for a mat for the PS Audio PWT

I have a PS Audio PerfectWave Transport. I have found in the past with other transports that a cd mat helps to improve the sound. I have several different cd mats. My favorite is a mat that I purchased from Herbies Audio Lab. However none of the mats that i currently have seem to work with the PWT. Whenever I play a cd with a mat, the PWT makes a lot of noise - a buzzing sound. The cd also gets very warm to touch once I open the tray. I am surprized the Herbie's mat does not work because it is just a thin layer of silicone-based viscoelastic that has adhesive that you stick onto the cd. Anotherwards, the mat is not loose on the cd.
I do feel I need to use something that work with the PWT. Otherwise I feel I may end up damaging the machine. Would appreciate any recommendations from folks who have successfully used a mat with the PS Audio PWT. Thanks