It sounds like the SR Black line of products are improving detail to a point that is not ideal for your system. That is my emotional response to my son's new 4K TV compared to my Panasonic Plasma TV. Too much detail that for me is distracting. He loves the added detail.David, I feel the same way regarding video.
As stated earlier, I got the same highly-detailed sonics when using the SR Black power cord. But the lush, sumptuous sound of the SR is addicting.
Regarding the Isoclean fuse, there's a very good review written by Albert Porter, although he's probably moved on to some other tweak by now.