Can a change in negative feedback sound better?

Every once in a while I think up something to help improve my listening experience. Sometimes it doesn't involve an outlay of cash but just a swapping out of something minor, or adding something I took out.

The last thing that greatly improved my system was going back to some old Mapleshade Helix speaker wire. The improvements were so good that I went and got the Double Helix version and was quite satisfied with the results.

Just for the heck of it, I dug through my discards and got a Dakiom feedback stabilizer that I quit using. I got it some time ago when I had a different amp and cables and it tamed a bright high end. After buying my Burson, I didn't need it any more since using it was a draw, at best, when trying to determine whether or not it had any positive effects.

Well (here it comes), with the Mapleshades in place of the Zu cabling, inserting it made quite the difference, especially in the lower mids to the the bass. It was like everything was cleaned up and clearer. I thought it was great the way it was and was only experimenting with the Dakiom device.
Bass was tighter, more detailed and nuanced, making the bass seem to go lower but I think that that part is an illusion thanks to the added detail and refinement.

The effects were beneficial all around as well but most evident in the lower regions. Can anyone explain why changing the negative feedback at the amps speaker connections would do that? The only variable were the cables.

All the best,
Nonoise