Did you conduct a double-blind test?
I (we) did quasi-double-blind type audition sessions many times, at least in my setup of the above "SP cabling board" with magnetizable screws+terminal straps compared with non-magnetizable ones. I changed between either ones many times, and my wife as well as my audio enthu friends (they did not know which was which) listened to the music; of course all the other factors/parameters remained unchanged.
I believe our audition sessions were almost double-blind, but I should say "quasi-double-blind" since I do not know how to perform real scientifically validated double-blind test under "statistically significant difference test" with statistically/scientifically strict analysis and validation; our audiences were only 3 people, my wife and two of my audio enthu friends.