hmm... I just had the exact same problem, actually, even though I love how these speakers sound, I have some complaints, they are not perfect:
1) As you said, the left front speaker is lower in volume than the others, I rechechked all the connections, and I found that where is connectes to the subwoofer, it wasn't being pressured down all the way. Why can't they just use stereo plugs? the speaker wire setup is so sensetive that if one wire pops out of those chep little plastic things, the sound fades. I have had to reinsert the wires into the sub numerous times, those little plastic things with the spring, they are a b#tch to keep down, they keep popping out.
2) It's 400watts of power, I'm assuming it's not using that much all the time, but it should go into automatic off\powersaving mode if there are no sounds after a few minutes.
3) sometimes, I have to "reset" the system, turn down all the knobs, disconnect the subwoofer from the controls, plug it back in, turn it up. I think if you leave the knobs mid level, and plug it in, or turn it on and off, it restarts from that level meaning you can't go all the way with the base, etc.
4) the fade feature does not click into a mid point so I really can't tell when it is balanced. Also, with the fade all the way to the rear, I still hear some sound from the front speakers, even after a "reset"
I'm sure they will address some of these issues in the next revisions, but still from the price I am satisfied.