Update: I was wrong.... deeeaaaadddd wrong
After giving the Utopia another shot with some different sources and amps, I have come to the conclusion that the Massdrop x Cavalli liquid carbon x amp is a giant piece of junk, and I should have never judged the Utopia being feed by that thing - and the Asgard 2, while it sounded better, didn't let the Utopia shine either.
HOWEVER, even with the modest upgrade to a Woo Audio WA7 Fireflies, I totally get it now (and before you jump on the fact that the WA7 is not a great amp by any standard, it is still WAY better than the other 2 I was using - My Schiit Bifrost 2 landed the other day, and I am patiently waiting at the mailbox daily for my Violectric V280 to show up and REALLY knock my socks off). Literally all of my previous gripes immediately disappeared, and the things I love about my ZMF and Audeze cans now sound muddy in comparison (and the tinny/sibilant highs that were my primary complaint before, have mellowed out dramatically)... Although the Auteurs are fantastic at well under half the price of the Utopia.
I'm not sure how much can be attributed to break-in, as the Utopia have under 50 hours on them in total (I have put about 20 on them since first posting), but at this point - who cares? I have gotten great suggestions from you folks, and I'm still interested in hearing more of your endgame pairings for the Utopia (for me: endgame is a journey for refinement towards perfection, not the mythical destination some claim is truly attainable - there is always going to be something better). So far, I have gleaned that the Chord Hugo 2 and Dave (my heart sings to get a sick piece of equipment with my name on it... ) are marvels in and of themselves, let alone their near-perfect unity with the Utopia. And don't you worry, I'm sure I'll have more to say about these once the Violectric arrives.