scientific double blinded cable test

If the goal is to reliably and consistently choose what sounds best, why would you use anything but your ears?

I would not question your assertion that in some fashion, the drawing/manufacturing process results in (however minute) directional differences in wire.  I do question (actually doubt) whether you, or anybody, can actually hear the result of those differences when the wire is used in an audio system, no matter how high quality the system.