I think the reason many of us switch between the different color temperature settings (Normal, Warm1, Warm2) is because the grayscale has not been properly calibrated. Just because Warm2 is Panasonic’s standard for achieving 6500K, it doesn’t mean that is what you are getting (many TVs from the manufacturer are set with red much higher in the dark band and blue much higher in the lighter band), which is why I believe some of us are seeing colors that don’t look as real to us in Warm2 and we are choosing to experiment with the other settings. Unless you go into the service menu you aren’t going to be able to adjust grayscale. When I have mine calibrated I’ll post the results.
Prior to having my ’03 plasma calibrated, on the 10-point IRE scale, my temperature varied between 7,764 at its lowest, to 9,052 at it’s highest. After calibration the lowest was 6,445 and the highest 6,774.