Thanks to everyone that responded, I'm really not obsessed with it. I was just curious if there was any way to better isolate things than what I'm doing.
It is good(?) to know that other people struggle with the same thing trying to just get their cables organized and it is just about an impossible job. That's why I wondered if there was anything to help.
Awhile back, I had some sheets from 3M that has some kind of shielding that I used, but of course those disappeared both from my supply and also from the marketplace. So I'll just happily move on and relax. And listen, like we are all supposed to do, right?