The various colored lines on your "RGB Levels after" graph are pretty darn close to the target. Look through a few Home Theater magazine reviews of TV sets, and see the sets they rated highly that are much further away from standard than yours is.
I am pretty confident that if you measured your TV without adjusting anything two or three times in a row, you would get two or three different curves that are all still pretty close to that target. That's called repeatability error, and it is what i mean by the error in the meter. You might be right on target, or a little off, could be up or down. I do not think we can tell with the meters we have.
Consumer meters are also, reportedly, even more inaccurate at the lower IRE levels. My greyscale looks all screwy down there too.
What matters in the end is that my picture looks really good, and I bet yours does as well.
I do not know how to make the gamma curve flatter on this set. The gamma adjustments just move the same diagonal line up and down the scale, and maybe affect it's slope a little, but not much. I am going on memory here, I have not played with this in a while. If anybody knows how to flatten this out, I would love a lesson.
B&W CDM CNT
B&W CDM 9NT