Most likely there is spring contact with the wheel turned, or under compression, if the camber plate is "maxed out" with stock springs.
The damping curve on FSDs is not suited for throwing the MINI around. A tie rod or rim will bend before the knuckle would. Look elsewhere for the camber plate issue, perhaps the bearing is turned around.
Increasing front camber with toe remaining constant, contributes to understeer. It does reduce the tendency to push
