question about rear springs

I am thinking that a little stiffer wouldn't hurt handling especially with a big sway bar front and rear. I am hoping anyway because I am going to set mine up like that. Low and stiff is good but the car has to lean enough for the weight to transfer for traction but not so much where it causes the car to push itself off the road. This is just a theory I have and I am welcome to hear everyones thoughts.