Texture Blend Problem

Hi everyone!
I’m having a problem blending a base color with a decal mask and a rust/dirt layer based on the alpha channel of my textures in UE4.15.
Already tried a lot of stuff, but nothing gives me the result like in Photoshop. Somehow the blended textures getting brighter then they actually are.
I attached some pictures. Left side is the albedo with decal and rust from Photoshop and on the right side the result from my master material. Also added the material setup and the rust texture.
Some help would be great :slight_smile: