Very tough to give any good advice here. This is something that needs a road test to get a feeling for the car. I can't judge the severity of the bumps, the speeds needed, the turning angles required, etc.
But, often times the inner bushings in the factory Tension Strut (lower control arm) are fluid filled. Over time they leak and develop play. If they have never been replaced, this might be a source of your problem.
Other than that, it's something a good suspension guy should drive to get a feel for what's going on.
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