75 Ohm
1) Use only 75 Ohm video cables.
2) As listed in the first reply check you have selected the correct input and output mode.
3) It is unlikely that your image should need that much correction, if you have high quality equipment. It seems like you do. Think of color correction like EQ. With short run video cables, you really shouldnt need correction in playback, if your set-up is right.