As already pointed out, the picture control settings have no effect if you are shooting RAW, unless you use NX2 for PP.
However, the picture control settings can still be useful. I set contrast and sharpness on "high" whenever I am using MF and LiveView. With these high settings it is much easier to get sharp focus at high magnification.
On the other hand, if you are using normal AF, it might be better to use standard picture control with all sliders set on "low". I believe that under these conditions the histogram most closely reflects the RAW file.