I do not see rear sway bar links in your list.

Made a world of difference when i was doing my SE suspension.

Cheapest part to replace in entire suspension- like $5, 10 minutes to install.

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'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E