The Control BT cables was a while ago. I got some improvement with hot water, but they never entirely straightened out even after multiple treatments and hanging them for months.
After a while I had a mismash of several brands of cables, and wanted some consistency. I wound up replacing them all with Modular Addict braided cables. They are cheap, stiff, don’t kink and hang straight, and worked well when I was using vertical racks.
But when I switched to a curved case I found myself wanting softer, draping cables, so I switched to Modular Addict skinny cables instead. While they weren’t kinked like Control cables, the 18" ones held a curve for the first week or so – hot water didn’t help much, but hanging them with some weight did. They’re all good now though.