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Try putting an equal load on both springs & measure how much deflection occurs...

Or swap the springs side to side in the Imperial & see if the sag follows the spring or the car...

I know of a couple cars with frame issues that have been adjusted around to sit level but really need to go on a frame rack & be reworked...

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Whew - that would be a LOT of work to swap the old springs side to side to see if the sag follows... I think I'd rather just install the new ones and hope that the old drivers side spring was "sprung" or had lost its "tinsel strength" and that part of the phenomena with sprung springs is that yes, they do go back to their original, arched shape with no load on them and appear "fine" when out of the car. I don't think I can return the new springs anyway even if that isn't the problem. Thanks for reading everyone!