Wrapping power cords and interconnects with copper foil.

Snake oil. All of it. At best, nothing is happening. More probable is your adding interference. Walk away from this. 

Reading passages from the Bible, Torah, or Koran will have the same effect from my experience or simply burn incense which may have a pleasant psyco- acoustic effect as well.

Reading passages from the Bible, Torah, or Koran will have the same effect from my experience or simply burn incense which may have a pleasant psycho- acoustic effect as well.

Audiophiles use very good equipment and use at least good cables. It is strange that very expensive power cables aren't FCC tested and often not UL listed. RF in cables hasn't been a problem in many years. I think your equipment is properly designed to limit RF problems. 
I used RF microphones on the actors on the movie Titanic with 4 radio and TV stations only about ¼ a mile away 25 years ago so we had to be careful but the problem was fixable. RF is not a factor in SQ with at least decent equipment. Stop using expensive cables use good cables. 

I did in the past and it worked, but my best practise is to bind power cables along the rack (to the left or to the right, depending by the positions of power and interconnect sockets) in order to keep them as far as possible from interconnect cables (which are always short enough to make a simple curve for keeping them far enough from the rack or other devices).