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Possibly both.
Slight disc warp will make the make the bushes work harder - they are being asked to absorb more vibration from the hub. This wears the bushes more quickly and can lead to more warping of the discs. The wobble varies with speed as you can get a harmonic between the two. Also varies with outside temp as the bushes become harder in colder weather. (they are rubber).
Poly bushes get rid of this problem (as does rose jointing) but you loose lots of play in the steering/suspension. Good on track, uncomfortable on UK roads.
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