I'm having a hard time remembering all of the options but yeah with the sliders at that you should be getting 60fps. Try turning night shadows to low or off, when I did I gained roughly 10 fps. I honestly don't know what the problem could be, I only have a gtx 470 and a slightly slower quad speed (3.01ghz) and I can get 57-60 with everything on high except for night shadows and the sliders at 35/100.
Maybe someone with much more tech experience than me can help because something there isn't working right. You should be getting better performance than me.