There's a couple of other things to do which can tame a cars handling without changing springs and damping (i.e bump handling).
You can raise the roll-centres, which will give the car more roll-stiffness for the same spring rates (similar to the effect of an anti-roll bar, but without physically linking the two sides of the car). You can adjust caster to change the steering feel, or even change rear toe to decrease rear grip.
If you have an adjustable radio, a decrease in throw or a change in the steering curve to make it milder near the centre can also help - too muck lock and the car can grab, and less lock will often carry more corner speed, so long as you can negotiate the hairpins.