I spent the last couple of hours doing the following

1. Moved the speakers back towards the wall. Now the gap is only 9" instead of 3 feet.
2. Moved listening spot forward correspondingly.
3. MRC again.
4. Filters at 400, 450ms
5. Finally chose 450ms with +1.5dB treble.

Things starting to sound familiar now. Let's see how it pans out over several sessions.

Thanks a lot for all the assistance.

Question- Is there a "right" decay time for a given room size?

Oppo UDP-203, Sonos, Nvidia Streamer, Fire TV 4K, Trinnov Altitude32 into Dan D'Agostino Momentum into Wilson Alexx, Paradigm Sub 1, Monitor Audio In Wall surrounds, JVC NX9