Forgive me as i'm a noob when it comes to the Outlaw 975 other than knowing it has no room correction, but i'll take a shot at this. The fact Godzilla crushed your sub rules out the sub as the problem as you also have determined. We know the .1 channel is working well. What format are you using for music because unless its a bluray concert or SACD there wont be a .1 signal sent to your sub.
So then your mains X-Over point will come into play as well any what ever other "music" setting options your 975 has,,, what are they set at? Also if you have an "all channel stereo" option have you tried that?
If your mains X-over is set below 80Hz set them back to 80Hz,,, if your 975 has (small or large) options on speaker settings set to small.
-Funk 21.0LX Master/Slave combo 4800 watts RMS/9600watts (peak)-
-Chane A-2.4 L/C/R
-Chane A-1.4 side/rear surrounds.