The symptom you describe of wobble on slight curve is almost always from the front axle rear control arm ball joint.

The two tests to confirm:

1) gentle brake from 50-40 mph
2) at 60-70 mph make very gentle "s curve" on the center lane of a freeway (so you are on the top of the crown)

With #1, you'll get wobble on the steering on initial brake application that will stop once it gets firm.

With #2: you hold the wheel with just thumb and one finger to allow it to wobble; as the wheel passes dead center you'll get 1-3 wiggles fighting the cross.

I had this issue for about two years and even after replacing all control arms and ball joints still once in a while on certain roads I'd get the same exact wiggle!

Infuriating!

Turned out to be steering rack!

With engine off I had a buddy steer back and forth and could feel the clunk as the gear worked through some backlash!

FYI I still have the replacement rack as my car was totaled by a deer just before I got to install it.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)