Another addition since enough time passed since the last update.
I've come across a similar situation 20,000 miles after the last post and doing all that.
This time, the culprit was the rear subframe bushings. They were getting loose enough to rock the car upon up and down motions cresting over bumps on highway road surface.
Replace these crossmember bushings or add rigid collars available to reinforce the four bushings. Problem solved, once again. These cars are sensitive to alignment changes. Yes.
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