There are many ways to make your DFP feel less strong.
Are you using it for GT4 (PS2) or PC???
- Press on your DFP: Select+R3+left shift paddle. You will see that the left LED will flash once or twice. Once means: less force feedback. Twice means 100% force feedback.
- go into the settings of the game and use less force feedback
- if you use it on your pc, go into the logitech gaming software (profiler) and go to settings. There you can lower the force feedback %.