1. It´s not a hack. You get good results with changing gamma and brightness to max and set HDR quality to low instead of very low. It´s in the game video settings.
2. Yes, it´s not the way it should be. Night settings / shaders should be adjusted and chemlights or red flashlights will come in the future for sure.

Did you try to set mouse smoothing to zero/none?

@Remote Six (3rd Pic): Is that an issue with the fir-LOD ( = depends on distance)?

Same with dark-brownish wooden house in Drozhino.

This might be in correlation with changing light conditions i.g. running through forrests while the sun is shining.

Thats at three valleys.

same here. got pushed by a buddy through the wall. switching servers doesn´t help.