>>I measured the angle difference between the front edge of the tonearm and the front face of the cartridge and it is 5.719 degrees. It's way off.<<
This is immaterial. Quite often the cartridge is not parallel with the headshell in correct playing position. It is quite possible for the cartridge to be offset 20% from parallel and still be aligned properly. Depends on the cartridge and headshell configuration.
Without a view of the stylus in playing position, we cannot discern if the OP claim is true or not. I believe he is confusing cartridge postition in the headshell with the cartridge sides and stylus being parallel.
This is immaterial. Quite often the cartridge is not parallel with the headshell in correct playing position. It is quite possible for the cartridge to be offset 20% from parallel and still be aligned properly. Depends on the cartridge and headshell configuration.
Without a view of the stylus in playing position, we cannot discern if the OP claim is true or not. I believe he is confusing cartridge postition in the headshell with the cartridge sides and stylus being parallel.

