Hey Dead3yez. In your add-on 'FPS Helper' the screenshot on the download page shows a very nice 78 FPS. What was your system specifications when you took that screenshot?
Amd 5200, 8800GS XXX, 4Gb ram. Settings where low/medium
Since I have a better system now, that mod does not seem to help as much now. But with my old system it helped wonders.