Interesting, which manual do you have?
The manual I downloaded before I bought the car says to use 4mm of spacers on the rear hinge pin. My printed manual (that I used when I built the car) says 4.3mm (a 2mm and a 0.3mm behind the arm).
Page 14 in both manuals.
You need a little movement, but only enough to keep things moving freely, no more.