I find sit at 8:30 right now with my HE-5le. That is loud to me. Listening to anathema by the way, just for reference. Dunno what I am to think of the 5le, it's pretty dark in the mids and a little sibilant.
I have just slapped on the pleathers with damping holes and slightly vented, it seems to slightly increase or loosen the bass and shelve down the treble response (and upper mids), makes for a more intimate sound. It is the 'old' velours that came with it by the way.
Ru using the emotiva with the he5le? The he5le is a brighter phone then the he500 so a good tube amp or a warmer sounding ss amp would do it much more justice.