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So, doing some research and found this response from an E92 owner - may just be it.
"Had the same problem. The issue is really to do with the tolerance of the lower shock bushing. If the bushing it to tight then the you get loose condition at the lower camber link ball joint at the wheel hub. If the shock bushing it to loose in the camber link then the you cannot tighten the lower shock bolt enough. If there has been a lot fretting on the lower camber link mounting interfaces you need to replace it.
The work around for at least a loose condition for the lower shock mount it to use a friction paste product called Park Tool SAC-2 at the interface between the shock bushing and lower camber link. This will increase the clamp load by 30% for the same torque. You need to make sure none of the friction paste enter the threads.
The friction paste has suspended micro silica partials which is harder than the base metals. It is a micro gap filler by mechanically connecting the two interface with micro undercuts which prevent slip. it is very effective.
The torque for a zinc plated M12 bolt is a nominal 78 ft-lb. If the bolt is being reused then can consider the threads partly dry and increase torque to 83-85 ft-lb. If you lube the thread then the torque max torque is 70 ft-lb. Do not recommend lubing the threads. Do not exceed 90 ft-lb or the bolt will fail in time.
If the shock bushing it to big you either have to replace it, lap it down or use a facing tool to removed a micro amount of materials."
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