Neutral Sounding Silver Cables?

I have that same set up running vandersteen sevens. I am using kimber select silver. I find them kind of harsh and overly bright in my set up. Now when I was using quicksilver v4 and vandersteen 5a it was a well matched cable. I just thing the atlas is so much faster than my old amps also pairing a faster speaker the silver got twangy, at least the kimber, copper might be better or a different silver cable. In any case I would try to demo something. I don't know if this helps but it is what I think of in my set up. Ymmv.

Siltech or Kimber KCAG (Which I do not find bright)

In my experience, Ridge Street Audio Poiema 3s fit that bill very nicely.

There are no neutral cables.
Try some better Purist Audio cables too. I would also try DiMarzio M-path cables, $150 or so for a 1.0 M pair new. They may not have silver in them but they are very balanced. In direct comparizon in my SS system they were very close to Purist Maximus which cost $800 new, and highs were perhaps even a little better. Not bright at all, excellent bass. Great value.

I had used a number of cables between my BAT VK-D5 and pre, before settling on the Kimber KS-1130's(about 6 years ago). They simply let everything through(freq extension-both directions, without bloat, becoming sibilant or grainy/great sound stage-WxDxH/Precise imaging/ambience information/instrumental tonality and decay, etc). Every change, that I have made downstream, has just allowed more music to flow, from the CDP and Kimbers. Ditto, with the Kimber KS-1030's, at the output of my phono pre. If a system sounds overly bright with them connected, they are simply passing an overly bright signal, from elsewhere. That is the nature of any cable that is more neutral(passes more information/signal, without editing) than another.