Otto, the fact that it looks fairly close at default Expert doesn't surprise me since you have the IPS panel. I remember how little bstarfish and djams had to adjust to get the colors to match. The non-IPS panels, like my 60", are a whole different story. I simply cannot get red and green to match gray, but that's ok. I found that the best calibration I can do on this set is also the easiest and fastest:
1. Reset ISF Expert 1 or 2 to default
2. Increase Backlight to 65 (to be used with the Energy Saving feature)
3. Set Contrast to 93
4. Set Color to 52
5. Set Tint to G2
6. Go to Expert Settings and turn off Edge Enhancement
That's it . Brightest possible picture with tint-free grayscale, no color clipping, no black/white crush, and best possible black level.
After trying djams suggestion to change gray luminance via 2-point RGB adjustments, I can now say that without meters there is nothing more that can be done.
LOL, that's what I had on Expert 2 before I tried the AVS 709 disc.