Okay, following are my new settings using the CC20R filter. I'm getting much nicer black levels with the filter on (lower in perceived level than a 10IRE window on my RPTV), notice less chromatic aberration with the iris closed a bit more than before, and it's very much worth the small expense. However, keep in mind that I had an ISF-calibrated RPTV to compare it to while adjusting, so it might be more difficult to use a filter if you have no reference by which to make your adjustments. Also keep in mind that these settings will likely change once I get my Smart III system.
Color temp=User (started with Mid and tweaked)
Lamp mode=Theater Black
Gamma R, G, B=0
Auto Black Stretch On
I'm getting a 1dB line level attenuator to put on the Cr cable tomorrow, which should help with the 10% red push I have. I'll report back once I've tried it. In the meantime, I'm going to watch Alone In The Dark and Assault On Precinct 13.