While I reed in the tonearm setup instruction that the tonearm needs to be parallel to the surface of the disk, there are some real expert that stat the tonearm should be raised be a few mm at the bearing side.
FWIW, I always start with top of headshell parallel to platter surface and if necessary adjust up or down in tiny increments (<2mm typically) if need is perceived. And yes you can do this by ear.
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