Too bad I don't have MIR. But it's informative to try to approximate your example nontheless. At least for me, that is :-) Anyway, I see what you mean about the ERs being more vibrant in your example. That was actually a very good hint. I switched to an IR with more pronounced ERs (wow, does that sound geeky? :-)), and I like the result much better then my former attempt. The timbre doesn't approximate your example anymore (it's 'clearer', less warm), and in my eagerness to demonstrate the new ERs I may have pushed the instruments further back. But it's more a test to see whether it comes closer to what you thought was previously missing: a natural vibrancy in the ERs.
This one sounds pretty good to me:
http://goo.gl/MzSlRg
This one has even more ERs. It's almost a bit over the top for my taste. But could be that it has what you are looking for:
http://goo.gl/o9BkDD
As an aside: In your example I can hear the reflections coming from the sidewalls really well, especially on the second note. I like that. That's less so in my examples. The reflections from the back wall are stronger there. In return I think that the instruments positions are slightly better detectable in mine.