Normally, when you select Full-T&B, you get exactly "a file that is 1920x2160 pixels (2 FHD images stacked)". The only thing that you can try to change is the aspect ratio. Try to switch the Settings -> Full-SBS/T&B aspect ratio option, but it's identical to changing manually the aspect-ratio argument in __MUX_3D_OPTIONS.txt.
If that doesn't work, I don't know what I can do. My old Samsung TV displays always the 3D movies full screen, regardless of the aspect ratio specified in the MKV container, but it doesn't support Full-SBS, Full-T&B or 4K. It seems that the newer models are even more picky for the resolution and AR. Maybe you can try to find the answer in the doc of the TV, or in a Samsung forum.
Sorry, but I can't help much more.
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