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There are 2 types of bump steer , one from soft or worn joints which allow the wheels to move out of alignment . And the main one which is where suspension movement affects the steering giving unwanted tracking variations .
It sounds like you have one where one side of the steering alters the tracking with suspension movement .
The worst one I have come across was about 40mm of tracking movement from suspension travel , & that made the car very twitchy & difficult to control , excessive tyre wear , erratic breaking & not very nice at all .
Normally a few mm of variation is about the best that can be got [ depending on car etc ] , but if you have 1" then it would be a lot better if you can dial that out .
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