Again, just for clarification as I did not see it mentioned, you must roll the car back and forth and jump on both ends of the car to set the suspension in between making adjustments and taking another scale reading. This is VERY important and will change the scale readings significantly. Without doing this your numbers will not be correct and there will be virtually no repeatability to you readings. You should have flat platforms either before or after your scales. Roll the car back and forth and bounce on the car only when it is on the platforms in order to not potentially damage the scales. All scales must be on a, relative to each other, level surface.