Surprised at Low Household EMI Readings

One of the first things I learned when I started pursuing high end audio was to listen first and... well, over time was to ignore most measurements. There are so many variables that to isolate a couple and attribute the results to them will be too confounding to be helpful. I was trained and professionally a scientist for a decade. 

If you want to put together a great sounding system then looking for measurements and applying logic, then making purchases is dead end. You will end up with a very mundane uninspiring sounding system. Listen to well seasoned audiophiles and use observation as you primary tool. 

I would be willing to bet that you would hear a substantial improvement by installing direct lines and also by upgrading power conditioner... and depending on your equipment installing audiophile duplex receptacles.

I don’t think in my fifty years pursuing the high end has measuring one or two variables ever told much of the story. 

Go to a dealer, borrow a top of the line power conditioner. Now that is a appropriate test.