Viscous Coupling article.

[Evodelta]

Maybe try changing your driving style and getting some lessons.
I understeered out of one too many hairpins, threw the keys to a rally driver who jumped in and promptly slid through them sideways.
That and a properly designed and set up suspension system which came afterwards. Just chucking on hard springs is never going to cure anything - quite the opposite, it will make things worse, the secret is in the damping.