Wow Mojo, your claim for the M2's boggles my mind. I just can't fathom the small M2's have that kind of performance. I have M2's, but they're the surrounds on my HT system so I'm only hearing secondary performance. We'll be redoing that room sometime over the next year and when they come down I'll try them with a sub in my music room and get back to you.
I'm curious, what kind of music do you listen to on the M2's, and what size room? (I'm mostly listening to blues, jazz, and classical, in that order; and in a 13'x14' room.)

I have the M5's a little high, the woofer is at ear level. I'm thinking of getting angled isolation pads to tilt them down a bit, but they sound good so I'm in no hurry.
I do have them horizontally toed in toward the center point of my chair. I might as well add that they're about 8' from the listening position and about 6.5' apart.