George, you will not solve your problem by shuffling spring pads. if one spring is damaged or the frame is damaged, a spring pad is not the answer. as Don said, one inch is a hefty makeup for a rubber pad. The change in height created by the pad is a static measurement. You have not really affected the geometry other than the height. You will have to determine what is out of whack. It may be the frame, diff carrier, or any of a number of suspension pieces. If you lower the sprung load onto the suspension, the negative camber will increase. Put a barrel of Foster's in the trunk and see what the rear wheels do..
..All other things being equal, there is something wrong with your rear suspension. A pad may be missing, but it is not likely the primary cause of your problem..