I have measured the black level to be 0.027 cd/m2, so I think you are all right in the discussion. However, keep in mind that there is more to perceived black level than this number. Proper ambient lightning is crucial for one thing. This TVs screen is more reflective than, say, a G20 (I have a friend with one) meaning that in some situations the black level will be poor due to reflections. This set performs best in a nearly dark room with some very dim lightning behind or beside it.
I have to disappoint you but I am not able to give the figures for calibration without the color correction without pixel shader. The reason for this is that I have done some experimenting with LUT correction to even out the gamma tracking of the diffrernt color with good result. However, this also means that my current settings now (as of today!) are not transferable, since I have adjusted other things (and to make things worse through an auto-adjust program connected to my meter) outside of normal control.
Anyhow, the deal with 1366*768 without color correction (which I think should not be applied without access to a meter because it is quite tricky and sometimes messes things up) is to use about the same settings for white balance as I (and others) have posted regarding 1080p24. There may be small difference, but there is also small diffrences between diffrent sets.
You should really take advantage of 16 - 235 levels (without upconverting) as this means a lot less posterisation, which in turns means more detail. Also the settings for 0 - 255 are quite diffrent, so everything I say from now on assumes 16 - 235.
What is diffrent, then, is the brightness and contrast setting (always keep cell at max) These should be set with a pattern (AvsHD709 on this site). First you should decide what gamma you want. Gamma = 0 is roughly 2.2 and often the best choice. However, it goes down to around 2.1 and may thus be a little bit to reaveling in dark scences, especially in a dark room. If you have a really dark room then gamma = -1 is better and it translates to a gamma of roughly 2.4 You should not use the other gamma settigs other than for special situations (e.g., gamma = + 1 for gaming).
Turn up contrast to get a bright enough picture. This is mostly a matter of taste and how dark you room is. You can turn this up all the way to about 95 without getting any side effects. This may seem high, but it is because you have 16 - 235 levels.
After setting contrast, you should set brightness using a pluge pattern (or similar, such as the near black scale on colorhcfr part of avsd709) and adjust it so that black is pure black (no moving pixels) and so that you can BARELY see 2% above black. In 16- 235 levels this should be somewhere between 10 and 20 (depending on the contrast and gamma setting!).
Now, the gamut is somewhat oversaturated and warped towards greeen in this mode without color correction, but it is really not that big of a problem and the better detail giving by 1366*768 (although you wont get judderfree as in 24p) is worth it as I see it.