My experience with the SR Black fuses is similar to those of nonoise with his fuses. I listened to the fuses placed in one direction and then reversed this direction. Without fail there’s an undeniable change in the sound, not necessarily good vs bad, but "different ". One direction was very clear and "locked in ", the other had an "out of phase" character to it.
I don’t think there’s any need to pussy foot around here. Obviously - by YOUR own words - one direction IS better than the other. Sonically. It’s NOT as you say, "just different."