Got it solved!
The volume does go a bit louder now; not startlingly so, but noticeable. The overall SQ does seem to have improved. Treble seems a bit less dull (though still not crisp, this phone has a warmish tone), giving female vocals a bit more clarity and emotion, a slightly airier sound. My HD439 can go louder now without sounding distorted, and sound very nice. Great match with the TF10, too. Still can't do my DT770 LEs justice without the E11, but with it, they are actually very nice. Still not quite as dynamic and full-sounding as with my HiFiMeDIY Sabre + E11, but certainly nothing to be ashamed of at all. Perhaps even closer to neutral, though not as detailed and dynamic; less bass overall. Not at all a bad sound.
Edited by Gilly87 - 3/19/13 at 6:25pm