What Picture Control are you using (Standard, Neutral, Vivid, etc.)? Do you experiment with NEF to JPEG conversion in View NX (NX2)? By shooting a raw copy along with the jpg and converting in View NX you can make changes to Picture Controls, White Balance, Exposure Compensation, Saturation, etcetera. Then compare the two jpg's (one from the camera, and the one from View NX). You may be able to discover settings that will please you.
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Michael