My M80s are 8 feet away from me on the diagonals and I sit so me ears are in line with the bottom tweet. Theys almost up against the back wall and though I'd love to pull them out, I can't.

The sound is right where it should be a foot or so above them and usually in the plane of the speakers so not too far forward or too far back and they imagine pretty good given they're shoved back along the wall.

Something's pooched in your set-up because all this stuff about them M80s sounding knee-high to a grasshopper is weird!

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated