VPI Periphery Ring and turntable mats

I just got the ring a few weeks ago. I absolutely love it. Question - I had removed my Living Voice carbon mat before applying the ring. Does anyone use a mat with their ring? (anyone use the Living Voice carbon?) I seem to remember reading somewhere that VPI had advised to not use a mat with the ring. Anyone experiment? Appreciate your input. Thanks,
VPI advises against using mats period from what I understand. I've always heeded this advice on my Scoutmaster and haven't been disappointed with the results.
Thanks. I think I will stay as is. The ring did provide an incredible improvement.