Got it in the first post, Peter! "Caroline" is perhaps the optimum track to use because the cymbals are close enough to be being continuous throughout, and allows one to play with things while monitoring the tone. I was using a Perreaux 2150B at the time, nominally a beast of an amp, and there was a clear point where the power supply started to collapse, way below maximum volume - a lot of my efforts have been with amplifiers, these of course are a major weak link ...
I went and saw the band in their heyday, uuhh, 35 years ago
, they did well! Would you believe, here in Australia, they are a "mouthpiece" for one of the major supermarket brands, doing "Down, down, prices are down ... ", and a video to boot !! Issued a double CD with this version, new material, and live concert disk. They haven't changed a bit, well worth getting!
Yes, you've been on the "right" journey,
... . With the tweaking, that is. Those 5 albums are vital tools in your kitbag ...
One thing that is clear to me is that there are numerous ways of achieving this critical quality level, call it 100, which allows the ear/brain to bypass remaining weaknesses. Your current focus is minimising the electrical interference generated by the source reading process, mine over the last couple of years has been to tame interference entering via power supply weaknesses; both can do the job if the rest of the system is up to it. So, there is no "magic" way, but plenty of smart ways of getting there ...
Frank