ok, then everything explained.
issue was that i misunderstand normalType.
i observed changing it gived something like intensity, but its not.
cant we just add something like normalIntensity into PBR material? Similar to last change about AmbientLight, but just a param about normalIntensity this time.
i think it would help a lot, because instead re-bake normals each time you think it have too low or too high strength is time consuming. i think it would help a lot.
meantime i will try add something myself.