thrustmaster rgt ffb pro and GP4

Hi to all!i have recently buy this racing wheel, i want to know if someone use it for gp4, i have a big control, but in the high speed tracks like spa monza and interlagos mantain the car quiet at 300 kph is really hard!!! i try to modify aero and mechanic setup, and seem a little bit quiet with soft suspension on the back..anyway, i use cyberacer 's physics for 2009 season.
The force feedback is set to work via software

THANKS TO ALL!!!

Ale