Agree here.. get the shims. They are cheap and not to hard to install.When I took my Versa in for alignment after lowering, the tech pointed out that the toe-in for the RR was borderline out of spec.
I used shim stock under the front two bolts that hold the hub to the axle calculating the thickness using string along a set of wheels without tires.
Later, after I installed my NISMO suspension and needed another alignment, I had calculated perfectly and now toe-in on both rear wheels is .1 degrees.
This may be true, but I weighed the difference between explaining the problem to the service department, how I arrived at the conclusion, why I was messing with it to begin with (lowering), what they could possibly do about it (Shim! Blasphemy!!), etc, etc...and just rolling up my sleeves and putting it right.Rear axle sounds out of spec. If you have warranty nissan will pay for it