The toe inserts are approx 0.33mm steps (IIRC the step from A to B is 0.35) so a step of 3, say A to D would narrow the rear track by 1mm per side.
I personally tend to run the car 1 step narrower than the instructions (sorry car isn't in front of me nor the instruction) as that allows me to run up to 3.5deg rear toe without having to remove the front inserts, which is rear trans case out.
I typically run 2.5-3.0 deg but on the odd occasion the step to 3.5 is helpful.
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