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pifko
RTFM. It comes with instructions, right. Read them, maybe. If it doesn't come with instructions, maybe buy a more expensive crank / bb that does.
You don't use the spacers. Using the spacers will result in you side loading your bearings and that is bad.
This bb system (gxp) has a floating drive side bearing. The entire crank and Axel clamps to the non drive side bearing. If it is wobbly, then the Axel is not being pulled against the bearing correctly by the fat nut. Investigate the fat nut, and tork it proply.