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loosen the stem??

You didn't mention first loosening the steering tube clamp bolts on the stem. That's job one. There must be some gap between the top of the steering tube and the top cap. If the top cap touches the top of the steering tube, it won't tighten anything. The last thing to check for is the compression plug or star nut being loose. If the device that the top cap pulls against moves, no adjustment will occur.

Integrated headsets typically require more torque on the top cap than a conventional caged-ball unit, perhaps as much a 7-8NM. Tighten until some additional drag is felt as the fork is turned, then back off the top cap bolt just enough to eliminate the drag (maybe 1/8 to 1/4 turn).
 
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