or perhaps the woofers are wired out of phase but the mids and tweeters are in phase.

Like everyone has mentioned the system you currently have is far better than average. Im not so sure that going with axioms would be so much of an upgrade as it would be just different. There was a speaker comparison where someone did DBT with the M80 vs the top of the line veritas 2.3 or 2.4? not sure. Its over at the Av science forum. check it out

Haoleb's Audio/DIY Website