HERE is an interesting article that explains why stiff suspensions have less grip - and why you really shouldn't want stiffer springs than what the car-maker thinks is best for the car.

Also, the video below is spot-on about how springs work to keep (or not keep) the tires in contact with the road for better handling.

 

Do you want your car to handle better on the road? Coil-overs with soft springs, not stiff springs...along with strut tower bracing and firm suspension bushings.

Can you see the 'give' from the springs in Ken Block's Mustang (below)? They are not rock hard stiff by any means...


Enjoy Ken Block's run through Los Angeles!

You Tube

 

You do not want a soft spring on a lowered car for all the reasons noted at the end of the video (bottoming out, body-roll). A good spring/coil-over should have a properly tuned spring that increases stiffness just enough to reduce bottoming out, reduce body roll and still maintain a comfortable ride. The lower your ride height, the stiffer you'll need the spring to prevent bottoming out.