Do you mean if you move the wheel very far to the left it will lose the centering spring force? or do you mean a little to the left from center?
If it is far to the left, it might be something to do with the degrees of rotation. The Speed Force has a 270 degree rotation. Try setting your Driving Force GT to 270 degrees.
If it is a little to the left, then it's probably the deadzone setting being too wide.
Lastly, not telling you how you should use your hardware, but the centering force setting in the Logitech Profiler should be switched off for pretty much all force feedback games like Dolphin because it interferes with the forces sent by the game.
If it is far to the left, it might be something to do with the degrees of rotation. The Speed Force has a 270 degree rotation. Try setting your Driving Force GT to 270 degrees.
If it is a little to the left, then it's probably the deadzone setting being too wide.
Lastly, not telling you how you should use your hardware, but the centering force setting in the Logitech Profiler should be switched off for pretty much all force feedback games like Dolphin because it interferes with the forces sent by the game.