Eibach rear springs to low???

Hello gents, I installed the Eibach 1 1/2 inch front 1 inch rear drop springs in my mustang about 6 years ago and feel the backs have really dropped since then. I have a 83 gt vert and made sure to get the extra stiff/convertible rated springs but IDK i really feel the car is to low in the back. My right side rear tire is level with the fender and rubs bad when I have passengers in the car. and about 1/2 inch from rubbing on the driver side. I know my car probably has minor chassis twist but not sure what to do. Iv been debating going back to factory height for now or replacing the rears with different 1 inch drops just to see of there is a difference. Any thoughts?
 
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I have lakewood 50/50 drag shocks that are 2 years old. The tires are a bit large, the contact is on the sidewalls mostly. The problem really started after i changed my upper/lower control arms a few years back. All the bushings are shot at this point . I am in the process of changing my upper and lower control arms to some nice ones. I also purchased new prothan urethane spring isolators. Being I am going through all the control arm work if I should change out the springs to something new/different in the rear or give them one more chance with the new control arms, this is the debate I keep running in my head ugh lol.