Muzcal, your problem is so unusual and specific I'd recommend contacting Bob Graham directly on this issue...
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Recently redo my setup with the Graham and ran into a few scenarios which required reducing antiskate. None to the degree of what is happening.
1. Did you remove the plastic plug covering the bearing?
2. Double check your alignment.
3. Verify azimuth. If azimuth is off or the body of the cartridge is rotated significantly to compensate for correct azimuth, the additional mass on one side of the needle can contribute to centripedal or centrifugal force. If more mass leaning towards the outgroove, this will add to antiskating force.