The Silver Dragons cured my biggest complaint with the HE-- the lack of snap on snare drum hits and other instruments in that frequency range. With the stock cable, songs with a heavy snare that popped through the mix, were recessed. It made songs with a strong beat sound too mellow. I have no idea how a cable can affect a headphone in this way, it doesn't seem logical, but changing to the Silver Dragon definitely improved the issue to the point where I can report no flaws with the sound of the HE at all.
I have not auditioned any other cables, so I won't comment on what other manufacturers cables sound like.
I'm puzzled as well (and not only now). It's the same with amps: No one can reliably explain why they sound different or predict the sonic characteristic on the basis of measuring results.
Just don't ask these questions in the Sound Science forum!