I did suggest some ideas quite early on in this post, including the orientation of the tonearm relative to the record surface. Didn't get a response though.
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I would check tonearm settings, take record off, put stylus guard on, turn bias to zero. Assuming you have a turntable mat, lower the stylus guard onto the mat and gently using the headshell arm nudge the tonearm towards the centre of the turntable. It should glide easily towards the centre, note where you feel resistance, this should be, at minimum, where the record label should be.
If the tonearm tries to return outward turn the bias a little. Whatever your tracking weight is, the bias as a rough guide should be the same.
Check the vertical tracking angle if you have a small vial spirit level try setting the arm horizontal. If you don't have a tiny spirit level, do this by eye.
If all the above are ok you need a set up alignment protractor, this sets the cartridge and stylus overhang and cartridge angle relative to the record grooves.
The dealer should have done all this if he had the turntable!