I was going to say toe-in, but looks like you've tried that. What AVR are you using and what mode are you listening to in music: Direct, Stereo, PLIIx, etc? Also, did you configure by using setup, dB levels, distance, etc by using built in Mic or manual setup with SPL meter?

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85