This is the biggest list of snake-oil, pseudoscience i have ever seen on this site.
1. Send them off to cryo lab. While many high end cables are cryod by the manufacturer, Cryoing twice is better. Once you get them back from the cryo lab give them about a week to recover from thermal shock before critical eval.
What happens when these cables return to normal temp? can you document ANY physical change in the wire and how it could impact how the AC current benefits from it and PROVIDE it!
2. Establish correct direction.
How would one do this with audio AC which is completely random AND moves in both directions on the wire continuously!
3. Burn in using burn in track or burn in device.
Ridiculous, there is no scientific proof that cables have a break in, if you DO have measurable, documented proof please share it with us.
4. Suspend cables from ceiling using fishing line and eye hooks to escape vibration and static electric fields.
My favorite suggestion!!! Its right up there with Machina Dyanamica's Intellegent Box, not to mention the Teleportation Tweek!
5. Apply the contact enhancer of your choice to all electrical contacts.
Why? cables come with gold connectors for a reason!