I keep all post processing effects off. Sorry, I should have specified that. Black level should be set to your source, preferably to high for RGB sources. Make sure the device you are playing from is set to expanded black levels as well.
Dynamic Contrast: Off
Edge Enhance: Off
Noise cancelling/smooth motion: Off
Black level: High for RGB signals, Low for YCbCr signals. Auto will usually choose those settings for you depending on the source. Just make sure your device output matches what the TV is expecting.