Thanks Almarg, your recommendations are always appreciated.
Power in NYS is pretty stable, so there is less difference than folks on the West Coast where I have been told line voltage varies considerably during the day (actually, it was told to me by SMc).
I actually listened to the system for 3 days with the fuses oriented in one direction, so I was sure I was hearing the changes of what I thought I heard. I am pretty analytic by nature and have a good memory for sound, if that makes sense. When I was sure of what I noticed, I then moved the fuse to the opposite direction. It was apparent that there was a difference in sound quality and it was very evident.
I will take your advice, though, and try reversing them using the same music, at the same loudness, etc. in order to be as non-judgemental as possible.
Though, I will say that, yes, fuses do change the color of the music. In my case, it was dramatic.