And I have H&R Race springs paired with Koni Yellows on my CLS6. They are pretty stiff, but not in the same sense that crappy coilovers on the stripped Integra your buddy had in high school are. Stiff in the sense that they are fairly neutral in a straight line on a decent road, but will immediately respond when you turn the wheel as well as keep the rear balanced when braking. The analogy I always use to ask people about how a suspension setup performs is, "Would you take your grandmother to a doctor's appointment in your car?" I can honestly say that I would, but it's enough that I would expect her to comment on it. It may be the Konis that help me quite a bit, though.

Just letting you know you have some other good options out there. I'll be installing the Progress 24mm rear sway bar on mine soon, too. I do expect that to make the rear a little more harsh due to the increased spring rate that will result from the stiffer bar. I'm fine because of the added handling benefit. But if you have similar modifications in your future, you might want to consider the fact that for whatever springs you choose, the rear will be slightly more harsh with the rear sway bar.

 

Finally upgraded to H&R OE Sport springs and bilstein setup. The wheel gap is reduced but front still stills a bit higher. I had OE springs and KYB. The ride is firmer but still comfortable. Below is the new pic. Recently hit 164K! :-)

 

And this is what it was before...

 

Why don't you just use the lower spring perch on the front shocks?