Corner Weight Imbalance on SR3 XX

Hi Ron.  I don't have an answer to solve this but I would probably first check your scale accuracy and ensure they are dead level.  After I carefully set my ride height, I am typically way off on the corner balance.  Over 150 pounds difference between the rear corners is typical for my car, but this is not a problem.

To balance, I go around to each corner and give a full turn on each pushrod until I get within 5 pounds on the front corners.  This means lengthening pushrods on light corners, and shortening on the opposite corners.  The effect is no change in spring preload and it dials out fairly rapidly (usually 4 full turns each corner), however the ride height change is negligible  -- within a millimeter from start.  

If you are doing this with tires mounted (as opposed to set up wheels), I would use new tires and be sure that they are all inflated to the target pressure.  

Other than what I mentioned, I am a little stumped.  You should be able to press down on a corner when your car is on the scales and see a big swing in corner weight.

My opinion and experience is that you can adjust the front pushrods (but not the preload), and that does not affect the car setup negatively.  In one of the owner's manuals I think it implies that all of the adjustment should be done on the rear springs, but this was before there were pushrods on the rear corners.  So with this in mind, starting with pushrods with equal length is helpful, but after setting ride height and corner balancing, my pushrods are not equal length.  The equal length starting point is just to ensure that you have sufficient length adjustment to corner weight.  I don't touch the rear spring preload either during corner balancing on cars that have rear pushrods because the pushrods are sufficiently effective to balance.

I checked my scale start point when I last set my ride height.  This is the starting point after doing all of the setup steps but before final corner balancing.  LF/RF/LR/RR(pounds): 204.6/407.4/514.8/283.6.  So my corner balance begins over 200 pounds off front and rear.  The chassis has never been damaged -- that is just the way it is and there is ample adjustment in the pushrods to balance.  My final balance was 308.4/303.8/407.6/390.8.

Also be sure to loosen the adjusters for rebound, high and low speed bump all the way.

Ditto what David said. Most likely the scales are not set correctly being perfectly level, or a scale itself it not going out. Check and make sure no wires to the scales are pinched. Also make sure the tire pressures are correct and not all over the place. 

Not likely but if you have a dead shock the car wont scale up nicely/respond to changes.