Those were not made for those shaders.
Have you tried the entity_basic shader in the FPE file?
With the material I defined in the FPE file of 3 GG will use the common gloss and metalness ones in the effectbank/reloaded/media/materials folder.
But it looks ok with the defaults after your reboot.
Metalness - black is dialectric, White is metal
Gloss - Black is shiney, white is rough
Specular - Mostly grey scale except for metalic objects, then the reflectence color of the metal is used for the specular color. Not used in PBR
Roughness - Black is Rough, White is shiny - Game Guru does not use at all.
Displacement - White is height, black is lows - not fully implemented yet.
Normal direction +X -Y +Z
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