Well, I know that's majorly offtopic, but... how many FPS did you get with your 220 in Trem? Just wondering because I'm ought to buy one.
Now about the minimizing - I don't have a slightest idea about what that can be. But if you're using Windows, you got a rather wide assortment of possible issues.
What about backing up your config file and deleting the original, so the game can re-generate it?