[Tom Goldman]

Something that's often overlooked with this problem is rear thrust . I've had several cars with this issue that squaring the rear axle in the chassis ended the wobble.
Unfortunately curing radial wobble is much like fixing the "death wobble " on Jeeps , there can be many causes from toe, caster , front to rear shock settings and even tire pressure..
I have also heard of trying the toe out solution , while I would NEVER recommend it ,if it solves the problem ,I would suspect tire pressure it be an issue.