If the wheels have been balanced by a shop that knows what they are doing wth 4wds, then check the easy stuff first. Check the wheel bearings and nip them up if needed. Then check the panhard bushes by using a crowbar to lever the panhard rod. If all good do the same with all the other bushes.
If all good, disconnect the steering damper and force it in and out. It should have considerable resistance to movement.
If good, then play around with the shims.
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