Artifacts and NormalFromHeightMap

I’m editing material and I used a greyscale image as height map to create normals,

As I increase normal intensity, I see wider artifacts.

This is an example of artifact.
http://d.pr/i/11dBE

This is my current material setup.
http://d.pr/i/14cHw

Any advice would be nice. Thanks

Hi -

I am closing this question as a duplicate of the question located here, https://answers.unrealengine.com/questions/186059/artifacts-and-normalfromheightmap.html.

Thank You

Eric Ketchum