"Color space used to produce such results was sRGB; White Balance: AUTO; Metering: MATRIX"
While I commend you for the profiles you have set-up and made available, I'm sure you realize that using the sRGB colour space profile gives you the smallest colour gamaut available with about 6,000 colours.
For others reading this, the sRGB colour space is fine for web images or for use on digital projectors if this is your intention. However if you desire a larger colour space with better results and a larger colour gamut, the Adobe RGB colour space is superior for initial capture.
To find out what colour space you are shooting with, go to Menu->Shooting Menu (camera icon)->Colour Space. Clicking on colour space will give you two choices - sRGB or Adobe RGB.
I realize that in post-production, be it with Photoshop or some other image processing software you will ultimately have to convert these images to an srgb colour space for printing. However, some high-end printers and pro-print labs accept .tiff files in the Adobe RGB colour space, or CMYK if going to a book printer.
Something to consider depending upon the ultimate destination of your NEF images.
FYI - I shoot in RAW mode and use a colour profile set-up in the Raw converter of Adobe CS-4 to give me the results I want.