you mentioned that you put in new springs recently? how long ago and what springs were they?
the next thing you need to identify is it the front leaning down or is it the the other side in the rear pushing it up which will in turn cross load the opposite corner.
If you installed new rear leafs as well... I would lift the car up, loosen up the shackle bolts with the car in the air... then set it on the ground and tighten em back up. remember, especially with poly bushing hardware not to over tighten which causes it to bind up.