dieseldan44, I'd quit worrying about the "flexible" axles. Your trailing arms are cocked - that's the issue.

Springs, like us, get tired with age. May have the correct unsprung length but can't carry the weight, meaning they squish too far and pull the tops of the tires inward. Which isn't your issue, providing you have the right spring/pad correctly installed. Shocks don't carry weight - they keep the springs from bouncing.

Put a small block of wood on top of a floor or bottle jack, then gently push up on the fronts of the trailing arms and watch for excessive "give" in the bushings. Isn't much room to sqeeze yourself into. If I'm pulling springs then I'm changing those bushings. Be a good idea anyways at this point.

Trailing arms mount to the wishbone/center carrier. Wishbone mounts to car unibody in front. Correct parts/installation? Miss a shim? Wishbone mounts to differential in rear. Differential mounts to car unibody. Correct differential mount/installation? Shims?

Rear sway bar isn't supposed to carry weight - it just keeps things from getting too mushy back there.

Was the car in an accident? This may affect the wishbone/unibody alignment if the unibody is bent. The wishbone or trailing arms may have been bent by an accident or jack/jackstand. The unibody may be bent at front wishbone mounts or at differential mount from corrosion or many years of road pounding.

Bottom line: if the parts/installation are correct then you're going to need to shim something or live with it. Your fuel system will thank you for keeping the fuel tank full, by the way, and that's a few hundred pounds the rear end was designed for. One step at time and measure that camber/toe in before and after each step - you can do this at home. Remember to roll the car after putting it back on the ground.

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daBenz - 1970 220D