Ok, I launched it, how can I load this profile?
EDIT:Found it. But I can't select proper resolution for my screen.. I put 1366*768, editing the existing file, but still the resolution is abnormous.
I think that might have to do with the fact your monitor is 1366*768? In the FFXIII profile you set the resolution you want the game to render at (which is higher than your monitor resolution, as you use GeDoSaTo to downscale and thus improve the IQ of the game), while you set your main resolution in the general profile, though that's set by default to be your monitor main resolution.
It could be that you're gonna get black bars no matter what until they add graphic options in December.
Also, speaking of GeDoSaTo, I wonder how come it works better than nVidia's DSR. DSR fucks my mouse pointer speed in most games and in some games (mainly Blizzard games like D3 and WoW) it fucks the image quality and the text at any resolution except 3840x2160 when downscaling.