Eibach Pro-Kit

I purchased my car with the Pro-Kit suspension already installed. The issue I am having is that the rear springs are VERY soft. I can push the rear end down about 4" to 5" with one hand and very little effort. I am bottoming out the fenders on my new tires and I think this is the issue.
 
Are you sure the rear springs are from the PK? The part number should be easy to see on the spring itself.

As noted, that's not normal.