I picked up some 1/4 inch polyethylene tube (PE) and fed it through the Kimber Kable. As you can see, the cable is still very flexible, as flexible as it was before adding the PE tube.
I was looking forward to hearing a nice change in the sound but I didn't like what I was hearing. Now the sound was too analytical and added a lot of Sssssssss and ffffffffffsh sounds to the vocals.
As you can see, adding this PE tube spreads apart the conductors and I think it also acts as a dielectric. Someone who is in the know, please correct me on this.
So one or both of these two things are causing this change.
I removed the PE tube, and the cable retained it's larger size. Doing this did not get rid of the hot treble.
So, it was the spacing of the conductors that was the cause.
The cable in it's virgin form was braided snugly, so I worked the now loose-braid back and forth between my hands to close up the spacing, but not back to the point of a tight braid.
Leaving just a little bit of spacing in the braid has worked. I now have an extended treble but without it being "hot".
Unfortunately doing all this has disrupted the cable and I think they need to "break in" again.
I should add, this is on a 20 foot run of cable and I would expect this effect to be less on a smaller length.