Wow Dave, I think you are really over complicating this... You are seriously not missing anything in the backs with that cross over. You could lower them to 80 Hz if it makes you feel better, but I bet the sound would not change.

I agree, "relax and listen" for a while. This will drive you crazy if you try to make it perfect.

*It's a good thing no one told you about REW (Room EQ Wizard) software. You could spend weeks tweaking each speaker with that.

Dave
Audyssey Setup Guide