Moza R9 Wheel Spring / Centering Spring too weak at 100%

Everyone says the setting is useless unless you are using it for games with no FFB. Well, I'm trying to play the original Gran Turismo on playstation Colin Mcrae so I actually need the setting.

Its at 100% and yeah, pretty much useless. Does anyone know of a way to increase the centering spring past 100 so that it actually does something. Its bizarre because pretty much every other wheel i've had has always had this setting and it was never difficult to adjust to desired stiffness.

Anyway, if anyone knows of some way please let me know.