Yes applying a negative setting in the NR panel is one of the solutions I wrote about but can you tell us 1) if the NR panel is not active does the default NR apply? 2) when you set the luminous and color NR sliders all the way to the left is the NR really turned off?
It does look like something is still being done to the files even with it all the way left....
I wouldn't bother adjusting the colour slider.
If the noise panel is not active that you are applying the default amount regardless which is '0'. In the case of A.K. he may benefit from moving the Lumincance slider to -10.