Really then for the sake of spinning up some 50mm mushrooms and going to the 4x4 hub it would appear that all would be ok for caster and self centering as its the negative trail of the 2wd hub that is wiping out the effect of the caster this built into the suspension system. That would explain why you car self centers when reversing. Best to give tt a nudge and see if there is anything else odd about the 4x4 hub.
Bob
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