@mulveling : " just wasn't the right tonal balance in my system for my ears. "
Normally subjectivity is the personal characteristic that dominates the audio world against objectivity because normally too silver win over cooper but I can attest my self experiences like that yours only between different SUT manufacturers where the cooper Denon Murata outperforms several silver wired SUTs as the Audio Note and made it easily....
Now in your case is in the same model where I imagine that both SUTs shares the same design and this gives you the opportunity to think and make a system deep search trying to find out why what in " paper " should be better it's not through your first hand experiences other that the silver one was not inside specs for whateever reasons. At least is what I do in cases as this one. Everyday is a day to learn or confirm what we already know.
R.