Hello Nick. Nice clean system you have there. I agree with milpal about the subs. I have Emerald Physics EP 2.7's, (without D.S.P.) Clayton Shaw's last design he did for E.P. before leaving to start Spatial. I have a stereo pair of Vandersteen 2wq subs that I at first used with the EP's then when I tried them without the subs I found that the bass actually increased in my room. The open baffles are so efficient that the subs can't quite keep up with them and the quality of the bass is so good that don't even want to add subs back in. there is so much detail in the bass it is just amazing. (The EP 2.7's have two 15" woofers, and a 12" mid w/ coaxial tweeter).
Do you pull the speakers out from the wall when listening? It makes a big difference! Mine are about five feet from the wall and sound incredible! Best speakers I have ever heard. They just seem to do everything well. I'm sure the M3's are very similar.