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I presume you have played around with stylus pressure and arm balance. The latter seems to be an important aspect; so many arms are cartridge-end heavy and have a very different resonance from the motor chassis. Thus you get unstable pressure in the groove. Merely adding weight behind the pivot doesn't work too often because it lowers the resonance even more.
I had a friend who chopped large chunks out of a tone arm and was successful in raising its resonance so that it was more stable. Anything you do will entail major modification and is probably not worth it.
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