Mark,
You need to swap out the supplied power cord with some boutique brand.
It will reduce the "noise" and make it much smoother.
Gordon
I already did that.
I used a 50ft 12awg extention cable from COSTCO that I just purchased. I cut it down to 20 feet, wired it into the switch box with the 20A 110V breaker.
BTW that was two 50ft 12awg extention cables for $33.
You can't get anything any more exotic than that could ever affect anything on any system.