When you profile a plasma TV with fullscreen patterns, the light output behaviour of the display is very different from what it is when you watch a video (or still images). It is so because the APL of a real content is very low as compared to fullscreen patterns. So, you can think of it as using another display's profile for calibration of your TV (here calibration implies color transform generation by an ICC aware application). That explains why you see inaccuracies like red bias in the dark tones.
You can use Argyll/DisplayCAL (free software) for profile generation for your TV. CalMAN and SpaceMan ICC are other alternatives (you will need to buy the license). I am not very sure though how useful an ICC Device Profile will be for a Plasma TV. For the most precise calibration, you will need to generate a 3DLUT or an ICC Device Link Profile for your TV, to be used in an application or a LUT box which can process the LUT/ICC Device Link Profile.
Last edited by omarank; 05-24-2020 at 12:42 AM.