"The M5HPs definitely go lower, and even if they don't have much output at 10 Hz, they don't complain when attempting it."

This is exactly where I have a problem with my Dreamcatchers. Even though I have them crossed over to my sub at 80Hz, if I play too loud, they bottom out.

While the M22ti and the M3ti don't bottom out, they just don't sound good. The M5HP, with the v4 tweeter, the mid-range and the HP driver, high quality cross-over, improved knowledge about the family of curves and improved enclosure design I am sure fixes all the problems I heard with the M3ti and M22ti.