W124 Wagon Springs - Sportline or 500E?

[jonbobshinigin]

In my ongoing pursuit to get my wagon's suspension up to 100% (or perhaps 120%) I am now looking at replacing the rear springs. I am fairly certain they are worn out. I am wanting to determine if Sportline Springs or 500E springs are going to be stiffer. Both are available on Parts.com. Here is a writeup with some part numbers

http://www.w-124.info/w124/124_suspension.txt

I am looking to drop my car no more than one inch, and gain some stiffness in the ride and body roll. In my brain the 500E seems appropriate because I thought the wagon weighed more but as it turns out, the 300TD is 3400 lbs or so and the 500E is closer to 3900.

Yes I want some comfort, but also some decent track performance. Recommendations? The H&Rs are not appealing to me and lower the car too much and I hear they are a stiffer ride.