Duster rear stance uneven

My 65 Dart Convertible has the same problem! after I put super stock springs on. Did everything I could think of and finally gave up. Abandoned the project, went looking for a full gas can and a match. I even took one leaf out of the right side. No avail!!!

Again, a higher right side is normal for super stock springs. (1 inch by design)
But you probably found that out already. :D