dleblanc343, I share your disapointment with the LCD-3 regarding their shelved upper mids/treble. It's not so bad with bad modern treble-boosted masters because both flaws kind of neutralize themselves, but with more neutral music like yourself I find the coloration too much and the uneven transition in the mids makes the sound less transparent than it should. That's why I only listen to them with a little EQ from 2 to 12 kHz. The change in clarity to my ears is amazing, and the bass sounds tighter, the vocals livelier.
On the the other hand, I was surprised to read you find the Gungnir/Mjolnir combo colored and not very good with LCD-3. I don't claim it's totally neutral but it certainly pairs very well with my EQ'd LCD-3, much better than with my HD800. My old Bifrost/Lyr combo sounds "muddy" in comparison.
A wise man once said that (correctly I might add) that there is a plethora of "bright" sounding headphones and I for one am glad that Audeze didn't follow suit and introduced a neutral but NOT bright take with the LCD-3s. I don't understand why so many want all headphones to be on the brighter side of things....don't we have enough selection there?
With regards to the LCD-3, while I enjoyed them with Schiit Audio gear, I found that the synergy that existed with the LCD-2s was lacking with the LCD-3s. Being more revealing headphones = harder to get the upstream setup "right" (like the HD800s that way). But get it right (like through a Liquid Fire w/ a quad of E88CC Siemens, a B22, or even my GS-X), then they do scale up very nicely.