Little Suspension Problem...

[xspeed02]

Last summer I had new Eibach Sportlines installed on my car to replace the old stock units as well as fix the little lean my car had. Well about a year later and around 8k miles or so, the car still sits funny. The driver side rear squats lower than the passenger side and so does the driver side front, thought not as bad. I'm really anal about this and want my car to sit perfect, the passenger side sits great and if I could get the car to sit like that I'd be one happy camper. A friend told me new shocks and struts wouldn't make a difference.. Any opinions out there? The guy before me had a tow package on the car and a really heavy stereo system in the back and I think he destroyed the bushings or something. Would appreciate any advice, thanks.