To get rid of the above problems, you'll need to get your set, or any new set, calibrated. Professional calibration is the best, but runs near $300 to have it done. Second best option would be to purchase Digital Video Essentials or a similar calibration disc, costs $20-ish for the bluray, and calibrate the settings with their test patters. Last method is free, but not as effective way, is to pop in a Pixar film or switch your tv to the series 8000 (mentioned below) and adjust the for the few test patterns they provide.
To change your model (NOTE* THIS DOES VOID YOUR MANUFACTURERS WARRANTY*) power off the TV. Press mute, 1, 8, 2, power on the remote. The service menu pops up. Press OK on "Option". Arrow down to "Model". Press right on the directional pad and the model should now be listed as PN8000. Do not change to anything else except to the original PN7000 if needed in the future. Press return. Power off the TV to exit the service menu.
Once you power the TV back on a message will display saying "settings have been changed...blah blah" just hit OK. You'll now notice some additional available options in the TV's regular Menu. Change the picture setting to anything other that "Dynamic". Preferably "CAL-DAY" for a bright room or "CAL-NIGHT" for a dark room. Once a different picture setting has been chosen, arrow down to "Advanced Picture Options". In this area there should be an option called "Expert Patterns". This will allow you to correctly set your Contrast and Brightness when set on "Pattern 1".
"Pattern 2" is a little trickier. I'm guessing you'll need to select pattern 2 and then right below "Expert Patterns", "RGB Only" is an option. Hit OK on "RGB Only". Select the Blue Only pattern first since blue has the most imapct on other colors. Go back to your Picture Settings and adjust the Color until all of the Blues on the screen look the same. Mine is set to 46. Next, select "Red Only". Go to your Tint and adjust the tint until there are only 2 shades of red on screen, a lighter and darker. Mine is set to G44/R56. Last is green only. I don't know what you can do to adjust the green properly without messing up the accuracy of the other colors.