lewm
A distortion analyzer can easily show the results of a misaligned phono cartridge.
One could argue about alignment all day but I strongly doubt that misalignment or Stevenson alignment can account for this problem.It's much easier to get phono cartridge alignment wrong than it is to get it right. If LPs exhibit inner groove distortion, alignment is the first place to look if you want to be methodical. You're likely to be just chasing your tail if you don't first confirm that the alignment is correct.
A distortion analyzer can easily show the results of a misaligned phono cartridge.