The only thing better than finding a thread posing and answering exactly the questions you're looking for is realizing that if you'd searched for it two weeks prior, it wouldn't have existed.
One of the main criteria for any system of mine is always solidity and tonal density, which can be challenging to achieve without overly rounding things off. For ICs I'd settled on Anticables the last few years, but I bought a pair of 8402 last summer and now my interest in this rabbit hole is again piqued.
I'm very happy with the 8402 running out of the phono pre but they didn't work as well from other sources and that's because of the music itself. As it happens, all the records in my meager collection are either relaxing listens or acoustic instrumentation or both, and the texture and color from the 8402 play very well to that. When I'm playing CDs or streaming, though, I'm more likely to be listening to something that requires zippier transients, has more expansive soundstaging, or needs firmer foundations than the 8402 provides.
I'm definitely going to build a second pair with a lifted ground to see if that minor addition of air and speed will help but figured while I'm at it, why not find a few other options to make and compare. Go big or go home, as you say.
Thanks for this thread and I'm looking forward to your further findings.