Actually I had mine burning in for a very long time, probably upwards of 400 hours or so. In terms of the mids, I definitely agree that they settled down quite a bit from the initial out of the box sound. Like you I also referenced these with the HF3s as well as my UE 700 to be consistent.
The sound changed the greatest probably in the first week of burn in (~80 hrs ontop of the 16 that dosley had burned in). And they continued to change periodically until around 200 or so hours, though the changes were more so in the highs and lows than in the mids by then.
So from my gathering of the last string of posts, I think our definition of "shoutiness" still is a little different. In reference to the HF3, I personally wouldn't call them shouty. They do have an emphasis on the mids, but I regarded the "shoutiness" as more of a a spike at a certain frequency rather than an emphasis over the entire mid-range (though they are definitely over emphasized as stage monitors). So in reference to the to-may-to vs to-mah-to idea, the emphasis on the mah really only gets fatiguing with certain recordings (more often with female vocalists than male vocalists, there's almost a reverberation of sorts that happens).
In fact, I believe that both with EQ and the filters, they try to address this which is around the 1.2 kHz range. And by dropping it by a few decibles, it makes no change to the overall sound signature of the ASGs but it stops that spike.
With the filtered version, I feel that they seems to reduce the overall mid-range a bit as well as fix the spike that occurs around that frequency. However, they do come at the cost of seeming to change the sound-stage and highs a bit, though I'll refrain from judging until I get some more time with these.
So again, I think there is a definition issue of "shoutiness" that not everyone is in agreement with, and it is a matter of what one person hears vs another. For me personally, I am in consent that by the end of burn in, the mid range is no greater than the HF3s, but the spike was still present. I think this was the initial complaint that was found in the first
30 pages of this thread (linked to one reference), which soon got lost in translation and the term shoutiness has been thrown around and blown up since then to mean a mid-range over emphasis.
P.S. I can't find the link but there was that one site that someone linked that that played different tones when you clicked on them, does anyone know which that was?