High end audio sound quality is a balance. There are a number of overall characteristics. To me one of the most important it detail / musicality. You have already noticed this. The Cardas cable calmed your overly high frequencies. High frequency dominance gives you sparkle or as you called it glitter.
The glitter. Caution. With the ultra detailed presentation you typically get high frequency hash and overly forward (highlighted) treble and relative attenuation of the midrange. The benefit is that you hear things you have never heard before. The down side is the music tends to become dryer, fatiguing (from the hash that you don’t hear... but just puts pressure on your ear drums), and less musical. I attended the symphony for a decade and would go in and listen as if it was my system. Wow, you want to figure out what is wrong with your system... do that.
All of these system issues are intolerable to me now. I learned slowly about them by relentless pursuit of detail and imaging, without understanding of the down side. So, I’m just recommending to be aware of the down side. I’d recommend listing to some real acoustic instrumental music and noting how forward the treble actually is... how so much is powerful midrange, if you reproduce this ... you’ll get the music... what you want to move your foot, sway, and get lost in.
Coax = RCA... RCA refers to the plug ends and coax is the wire configuration... as opposed to XLR with three conductors.