Jkaalman,
I am not sure but I think you can change the resistor values on the tweeter section of the WP8 if you want to attenuate the highs or increase the highs. Not sure, but I have read threads of people using a different resistor set on the WP / Maxx IIs based on their preferences.
On a different note: w. Maxx IIs I also have bass problems. Of course room related. Next on my list.
I tried placement changes, a single subwoofer to augment the bass etc. Nothing helped. I was thinking stereo subs should do the trick but never tried it. I saw subwoofers in your system. Do your measurements include your subwoofers? I am sure if the WP8s are setup perfectly based on wasp parameters bass will roll off a little early. A subwoofer will help a lot.
Finally, how many concert halls attenuate bass? I know a crowded room sounds better than an empty one. Maybe more seating, and furniture might help.