Next try, PBR:
Standart tangent generator:
http://i.imgur.com/gSnNtRA.png
MIKKTSPACE
http://i.imgur.com/TkTTxz9.png
The problem was found via PBR exploring:
Next try, PBR:
Standart tangent generator:
http://i.imgur.com/gSnNtRA.png
MIKKTSPACE
http://i.imgur.com/TkTTxz9.png
The problem was found via PBR exploring: