Cable burn in

The AC based audio signal degausses any residual polarization that might be attributed to cable break in.  Sorry about that. 

Spend a hundred dollars and get a LCR meter.  Measure your cables.  You will then discover where your harshness comes from.

"Had my interconnect cables custom made to be 10’3.47” long….mathematically this is the perfect length as all the distortion has plenty of room to disperse."

Well that is true for one specific wire manufactured in a particular way. The math changes when you vary construction and gauge and strand thickness.

Cable cooking and freezing can change the math when it alters the metallurgical structure.of the conductor.

 You can reverse the cable and the math will change. Wire has a best way for proper electron flow.

 Avoid laying speaker cables on a bare floor as wood will change the flow of electrons and render your mathematically precise calculated wire to then be incorrect. Ceramic tile will not unless you have tile with heavy iron content. Also avoid finer wool carpets as they are prone to static electricity buildup which can effect your outcome too.

Sarc now off.

Hahaha! It's always a good topic to bring out the sour pusses dining on sour grapes. My experience in audio has been enriched by listening and trusting my ears. My experience and ears don't match everyone's I listen, or am in contact, with and I can only speak to my experience:  the very large number of audiophiles I've had contact with, am in touch with and have sat together and listened  on each other's systems pretty much all agree that everything can make a difference - and that cables are, and should be treated as, components. They to take burn in much like other pieces of gear. Trust your ears - you're on the right path in that you are listening and taking stock. Keep an open mind and experiment.

Cary gear tends to be a bit warm in their house sound and that can be heightened by cabling so it depends on the sonic landscape you enjoy. Keep listening and enjoy the tunes!

My main system was using rca IC's Nordost Blue Heaven which  I have always enjoyed even if they are for my taste and pocket a bit pricey. My amp got wiped out and I brought in a old Bryston 9B ST amp to substitute the same. When I looked over the connectors the BRYSTON besides RCA  had balanced connectors. I purchased two sets of balanced cables and paid around $50.00 for each pair. One is GOTHAM GAC Ultra Pro Cables and the other one is MOGAMI  I used one to connect my DAC a Denafrips Aries II to the FREYA + PREAMP. then from the pre to the amp  Substituted the Blue Heaven cables with these new cables and surprise, surprise the system went up in clarity, resolution and soundstage. What Im trying to bring across is that you have to hear your system with the cables that you have and then try a couple other ones. Some will surprise favorably others won't but you wont know until you do ty it out. Start inexpensive and the go trying others. You'll find the trip worthy. Good luck.