How are your Lower Ball Joints and lower bushings?

My SDL...Way back when I was getting similar cupping I re-balanced tires, new shocks, and criss-cross rotated the tires. Cupping came back.

With the recent new tire install I replaced the lower ball joints, and lower bushings. Shocks are kind of shot @ 80k or so miles. I've got about 10,000 miles on the new tires with no cupping wear.

Over the years I found that cupping is usually a function of poor tire balance i.e. lost weight etc., compounded by worn suspension parts.

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1986 300SDL 440,xxx