I am surprised to hear that they brightened up the M22's. If anything, I would have bet that they'd go the other direction and try to add more midrange warmth.
Thanks for taking the time to do this testing!
M80v2 | VP150v2 | QS8v2 SVS Pci+ 20-39 Emotiva UMC-1 & LPA-1 M22ti + T-Amp, in the Office