Thanks for all the info. Something to think about for sure re. m22 v4. Though I kind of have my heart set on going with the M60s.
I actually just cancelled my Denon avr-x3500h order and am thinking about going for the x4500h instead and doing a 5.2.4 config.
Thinking about it more and reading Dolby Atmos home theater installation guide, I am not so sure my space will be conducive to the overhead speakers and will likely go with atmos enabled add-on speakers.
Though not sure how well those will timbre match with the axiom speakers or how big a deal it will actually be if the timbre match isn't exact.
I would be trading in quite a few speakers - the m22, qs4 and 8s and a single m2.