I was also wondering about what @adg101 said,
My gear is significantly less costly, but I do use 25' balanced interconnects and short (5') speaker cables with a stereo amp. After doing an extensive comparison, 3 very experienced audiophiles (two are professionals) and I concluded that interconnects made with Mogami cable were far less colored than an "audiophile" pair with MSRP 22x as much.
Curious why not set your amps behind or beside your speakers and run a balanced cable from your preamp to your amps if you have a balance preamp? Yes, your amps are going to be out in the open but they’re beautiful.Since you have monoblocks, you could reduce the speaker cable length to nearly zero -- and it's the speaker cables that carry a high-level, low-impedance signal to a reactive load. A long balanced interconnect of the right type will have next to no effect on the sound. Whether you like the result is another matter, but it's the path I'd be likely to take with the sort of gear you have. It could be a startling improvement.
My gear is significantly less costly, but I do use 25' balanced interconnects and short (5') speaker cables with a stereo amp. After doing an extensive comparison, 3 very experienced audiophiles (two are professionals) and I concluded that interconnects made with Mogami cable were far less colored than an "audiophile" pair with MSRP 22x as much.