I disagree that the M80s need lots of power, I have a Denon 1800 (75wpc) and it kicks out the music plenty loud, now if the Outlaw is a weakling then.....

Also, check the placement of your speakers, perhaps they need to be moved around to get the "right" bass output.

As for break in time, I don't believe 100 hours is necessary but try leaving your system running while at work at a moderate volume for a couple of days if you don't want to listen to the harshness.