First off, never measure ride height that way. Measure from the ground to the bottom surface of the rocker panels front and rear. These cars are over 30 years old and the wheel wells may have been messed up in an accident. Your car might be level and the wheel wells poorly repaired.
Second, measuring droop is meaningless for any kind of comparison.
Third, if any of your wheels are wobbling, you've got a tire, wheel, or suspension problem.