Ferrite replacements for power cords

I have read ony many forums that Ferrite constricts the sound and compresses dynamics.

Well I just experimented with the Ferrite RF stoppers on my Audioquest power cables, and yes this is exactly my experience.

With them on, the sound seems cleaner, but it's not until you remove them you realise the body of the music was missing.

So my question is what are good equivalents of treating power cables that improve the sound instead of messing it up?

Surely there are other weird alloys and magnets that remove grunge but let the music flow as well?