Despite your rather intimidating requirement that a responder really know your components, let me offer some good natured advice. Having owned two different brands of silver, solid core, braided interconnects in systems with tubed DAC's, and Aronov 960i tube integrated amplifier, may I suggest that you can stay within your price range, and enjoy a "wow" experience by spending $120 per interconnect pair for a money back home trial from [email protected]
There is full range, detailed, and natural three-dimensional reproduction, together with pitch accurate, musical bass from both my Duntech and Platinum Audio Solo monitor speakers; even my Spendor LS3/5A classic mini-monitors outdid themselves. I can reasonably extrapolate that results should be similar with your superb speakers, which I only recently had the opportunity to audition.
Gregg also has over-achieving speaker cables for $180 per eight foot pair.
Only in your own listening room should you decide if you're finally hearing the mid-range magic which is within the capability of your terrific components.
Obviously, I do not have exactly your components, but I share your tube philosophy, and I know having a budget is no barrier to upgrading, in this era of direct marketing.
