It is possible to over damp a room, especially mid-high frequencies, which can produce a very 'dry' uninvolving sound (this is the reason some GIK traps, for example, can be range limited to work on the bass without killing the ambience in the room).
It may be that MRC is attempting to match the shortened decay times for the mid/highs (I believe that's what it's designed to do - although it only corrects in the bass, it measures higher than this in an attempt to get everything sounding even). My first instinct was to say remove some of the treatments and see if it improves, but then read you can't do that... Not sure what to suggest - pretty sure tweaking MRC will not bring life back into mids/highs if that is where the problem lies...
HC: 861v4/ID40/LPS, DSP5000, DSP5000VC, DSP3100, SW1600, HD621, Oppo BDP-105, Sony VPL-HW55ES 2-Channel: Oppo BDP-105, TEAC VRDS-7/Trichord Clock 3/PSU, 551, Quad 303, Harbeth Compact 7ES-3, Kimber cables, Russ Andrews mains and supports. Previous Meridian: 5000C, 5200SL, 7200.2, 6000, 562V.2, 568.2mm, 800v4, 808.2i, 818v2/v3, 861v8, 502
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