I could be very wrong, but I think bump-steer has more to do with the position of the rack (height, forward/rearward pos. and perfect paralelism to the ground axis) than it has to do with the length of the tie-rods, compared to the length of the a-arms. Of course, as long as the tie-rods are the same length left-to-right, not like the older beetle steering systems.
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