Have you considered reinstalling OSX? There is a possibly that there are some conflicts between the drivers for the anti glare and glossy displays.
With that said, I do not see where it says you have a glossy display nor why you cannot adjust the colors.
Just curious why do you want to adjust the color depth of the OS? If you want to adjust the color settings, you just have to click on the tab on the top labeled color.
And the refresh rate, should not be changed. The refresh is normally 59.94Hz (~60Hz) unless its a 120Hz display. Trying to force another refresh rate could cause problems.
Why are you running your 1920x1200 LCD at 1680x1050? This could be part of the problem why you think you need to adjust your refresh rate.
Run your LCD at its native resolution, if you want the display to be clear.