That should fix it for you. The overlay should bring a y=x line, not a curve. If you move the sliders, you may not be able to set gamma to 1.0 or whatever the default is. The only way to do this is to set it to advanced mode rather than standard mode. A straight line should then appear, but if it doesn't, you can make it yourself.
I got the straight line and all that, like i said i played w/ it all and it just made it worse. NVM about it though cause i just reinstalled the older drivers.