Given the high quality of your system I would test: Transparent, Cardas, and Nordost. These sound bring out the different flavors of outstanding neutral.
@mrrobot
I would steer clear of Nordost or Transparent Cables. My recommendation would be to speak with Albert Porter. He owns Focal and his advice would be spot on the cabling. I have spoken to him few times, very knowledgeable and great guy!
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