Sorry I didn't see anything about a fan but I have never look that the asus gpu tweak program either. Maybe you should try MSI Afterburner or Speed fan and TriXX GPU and see if you have any better luck.
Again I am sorry for the over board on it but I thounght you were trying to OC. Here are the 3 programs if you want them. Good luck to you.
Well that is good news. It is funny how sometimes we think something is so hard to fix and it turns out to be a simple thing. You need to pat your self on the back for a good job on fixing it your self.
You deserve it and hats off to yeah. I like to see people be able to fix there own problems. Well have a good one and good luck to you.