Anybody try doubling different cables?

It seemed logical to me,to try to get the most cable between the amp and speaker for best performance, so have double runs of Clear Day solid silver and Acoustic Zen Double barrel - an effective awg of about 5 or 6? - and they sound spectacular - better than each individually. Interested to hear the experts' opinions or anybody that has tried similar set-ups with copper plus silver of different manufacture and design and resultant increased gauge wire?
Not hard to connect with a combination of spades and bananas on both ends- double spades and one banana per amp side and 4 per side on the biwired speakers.
System: EAR 868 preamp, SOTA 4 turntable, Bel Canto mono 1000 ref amps, SP Tech rev III speakers, Mcintosh MR 67 tuner (better than my ss CDP!!) KCI silkworm +, GG reflection, Cardas GC, Mogami neglex gold ics, Pangea 9 AC SE pcs.
Thanks for your input.