I just decided to go back from Complicated Shader to Standard Shader setting, I do find the amount of extra artefacts unacceptable. I am watching on 2,50m wide screen by the way.
Thanks for the advice about uniform, will try that! I am using profile default settings now, except for Artifacts Masking, which I changed from Disabled to Weakest. This works best for me (smoothness versus artifacts).
Yes I tried custom resolutions, I did not work.