I thought the wheel was meant to sit 100% vertical all the time? No matter if you are cornering or not?
Mine has a gap of about 4-5mm too and never have this problem.
+ if wheels where 100% vertical at all thes there would be no need for strut braces or anti roll bars and any other gizmo designed to help the handling of cars
They are for stopping the wheels lifting off the floor and the car rolling over, not the wheel flexing/bending left and right.
