PBR ground material brightness reduce


It is my first involvement with PBR materials for upgrading the ground textures for my scenery.
I 've gone through the SDK and this video.
They were both useful and the result is the following:


I like it but I think it is a little bit brighter than I would prefer especially when looking away (where the circle is).
Is there any setting to reduce the brightness or is this what P3D creates as light?

Here are my settings (I use MCX to edit settings since I don't have 3DSmax)