I bought silver cables once and heard a night and day difference - until I blind tested myself. It absolutely blew my mind that the difference I perceived vanished just by me not knowing which cable I was listening to. After that, it no longer mattered if I knew. I had broken the spell.
I'm not saying that your silver cables aren't making a real difference. I'm just saying that a real night and day perceptual difference can happen because of sighted bias. Maybe it's better if you don't know...