Well, you have a lot of silver and silver plated cabling in the system which can tend to highlight the upper end. The Belden is supposed to be "musical" and "tonally rich". I have not tried it, but many have. I think you may need some more copper in the system. Gold, too.
Look at your power cord and see if it's a rhodium (silver) or gold connector(s). Rhodium can tend to sound a bit hard and thin out the mids - at least in my experience.
Look at your power cord and see if it's a rhodium (silver) or gold connector(s). Rhodium can tend to sound a bit hard and thin out the mids - at least in my experience.