The preferred solution is for you to use the reference drivers from the chiphouse. There is a special switch you can set on the Trouble Shooting page of the PowerStrip About box that may correct problems with some proprietary drivers. That depends on the circumstances. Sometimes increasing the refresh rate can significantly improve performance simply because it changes the interference pattern between the frame rate and screen refreshes. In other cases, however, an increase in the refresh rate could actually result in a decrease in performance, since some memory bandwidth is necessarily lost to refresh cycles.
Experimentation is required.
You can, but the process is a bit convoluted because the color correction support was added a full year after the program associations. First, make sure the game is setup and running properly. Henceforward, whenever you want to run the game with your custom display and gamma settings, select it from the PowerStrip Associations menu. The PS will first switch to the display settings you selected, then load up the custom gamma settings, then run the game. When you close the game your original display and gamma settings will be restored.