I actually found that the high frequencies (especially cymbals) were immediately clearer with the CT-1, compared to other IC cables. Using a quick switch, with an audiophile buddy also comparing, we found that cymbals were 'splashy' with the other IC cables, but more clear and distinct, more like live music, with the CT-1. If you think you may have heard more treble with your previous cables, try listening again and possibly you were hearing more treble volume, but only because of sloppy transients and high frequency hash.
And yes... the CT-1E is, as hard as it was for me to believe, noticeably better than the regular CT-1.