I have to say, if you have mats, cards, and/or TC in your system, and you also have High Fidelity MC-0.5s, or other HF products, you should consider removing the latter, to see if your experience matches mine (and Tim's).
I had been extremely happy with the improvements 16 mats brought to my system, but I am rather astonished at how much a single MC-0.5 was holding things back. It's been 3 days since I removed it. Tim says it takes 7 days for the magnetic effect to fully wear off.