Hi Marduk,
Your maps are from quixel , as i can see.
Difuse: Albedo map - Color profil : embedded (default)
Reflection : Gloss/roughness - Color profil : Linear
Bump : Normal map in a corona normal node. Check Flip Y (green) - Color profil : Linear
Displacement : I personally use the .jpg texture, Min level : -5, Max level : 5 (depends of your texture, it can be -10/10, -3/3 etc.) - Color profil : Linear