I have a Gen6 like Schmiddy and am running Pro-kits.
I haven't had any issue with stock or the standard Koni-Yellows.

I have heard that Koni doesn't recommend their shocks and Eibachs for the 97+ Lude. Did you check to make sure the Koni's will support the Eibach spring?
I would also double check that the Eibach part no. on each spring matches the no. found for your particular application. You may have the wrong springs.

Did you double check to make sure you don't have V6 or 4cyl-Sedan springs instead of Coupe-4 cylinder springs?