Since you're installing a relatively thin (5 mm) hub-centric spacer, it may be that it is not sitting flush since the hub extends too far. I know that I installed a set of 10 mm H&R hub-centric spacers and had to grind about a millimeter off the rear hubs in order for the spacers to fit flush. The instructions that came with the spacers warned that the hub could not extend beyond a certain number of millimeters; otherwise the spacer would not fit properly. This might also apply in the case of your spacers.
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