RRS1, adding double the caster via offset a-arm bushings will cover up many instabilities caused by worn tie rods ends, bent links or out-of-balance tires, but I approve of trying the other things before adding more caster.
Deeper into the system, stock steering rack bushings regularly wear out- 5000 miles is about the max life, and it's laughably easy to add zerk fittings to ball joints and tie rod ends to allow regular servicing. Zerks markedly extend their life for pennies. Details on request.
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