I'd say my only worries for the HK system were:
1 - Is the amp a real Class D amp and does it provide sufficient quality power to all the speakers? (appears to be, doesn't really distort at higher vols)
2 - Can the woofers handle bass heavy music? (passable, but even a single 12" sounds better)
3 - Are the tweeters too bright? (a little, but I've heard much worse)
I did a similar exercise w/ an RTA, trying to smooth out the EQ curve. And it sounds better after doing that. I turned of Logic7 as well.
VP Electricity - thanks for sharing all this info! Looking forward to see the finished trunk sub results.