first of all .. brilant game .. game of year for me or even one of best ever

but i have small problem there
first minutes of game , escape from prison is all ok . there are normal shadows and dark places can have reall black .. after that esacape . First and second mision looks like lost setting of brigthess so i set it up again . It says " adjust until dakrest symbol is bearly visible" so that how it was in the part esape from prison . now i have to make second dakr symbol almost invisible in order to have proper shadows in game.
That would not be problem offcourse but when using dark vison it seem that dark vision takes this second symbol bearly visible like it should and it is instead of seeing in dark almost black sceen with yellow people somehere there in front .. with turn on turn off dark vison i know it is dude behind wall but i dont think thats how it should be.
how can i fix this ?
i could go throught some confing file if you could tell me wich setting could fix it
please help ! i think shadows are really imporant part of this game.
btw, is it just my problem ?
sry for bad english .