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This all really looks to me like you are battling a vertical room mode, influenced by the monitor height. I haven't seen you do much experimentation with vertical modes, only horizontal (front, back, sides).
I haven't noticed you mention the ceiling height dimension, but I would guess it is in the problem area based on guessing from the pictures and wavelengths.
It also doesn't appear to me that the ceiling bass trapping treatment is nearly to the level of the front/rear/sides. What happens if you put your massive bass trap on the floor in front of the console around the monitor stands?
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