For comparison, here are my current un-EQ'ed 212HT + sub measurements. No house curve, yet, either.
The junk below 400hz is all appears to be room stuff. The 80-400hz stuff completely disappears in 1m measurements when I move the speaker away from the wall.
At least it's small enough that I should be able to EQ it out.
Interestingly, the 200-400hz range appears to be caused by floor reflections, which didn't show up with the Triads' WMTMW configuration.
I'm a little surprised the 212HT's MTM setup isn't more immune to floor reflections, but it could be a combination of my thin carpet over concrete floor and hitting just the wrong angle.
I'm going to keep playing with placement and treatments, when I get a chance.