If your ride is "bouncy" than you need new struts- they control the movement of the body of the car after the energy of a bump or pothole has been absorbed by the springs.
You didn't mention if you're SS struts were new when you installed them, but I expect Chicago roads are hard on any car's suspension.
You can order like-new factory take-offs here
http://www.ebay.com/itm/2010-12-Chev...30733179521%26
They're 39.95+shipping for a set of 4 from SLP.