If you have a ls6 intake, then the rears may be blocked off.
I can change the fan settings for you, but doubt that's the problem if it's fine while moving. The fans are normally off when you are moving at highway speeds. Do you have the deflector installed in front? When your moving do the temps come down?
I remember when I first got my car, there was a rubber cap installed on the bottom of the radiator that busted when I was driving down the road. I didn't know anything about it. Maybe you have one and it's slowly leaking coolant?
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