OP,
The height that gives you the best sound overall is the right height for your cartridge, as it most probably is near or just at the right stylus rake angle, which matters more than VTA.
Here's an article from Analog Planet: https://www.analogplanet.com/content/how-use-usb-digital-microscope-set-92-degree-stylus-rake-angle-sra Seven paragraphs down the article, there's a link to another article, "More than One VTA" which explains why SRA matters more. I never got to adjusting my SRA using a camera microscope, but I do it by ear by adjusting arm height until I get the best sound. Hope that helps.
The height that gives you the best sound overall is the right height for your cartridge, as it most probably is near or just at the right stylus rake angle, which matters more than VTA.
Here's an article from Analog Planet: https://www.analogplanet.com/content/how-use-usb-digital-microscope-set-92-degree-stylus-rake-angle-sra Seven paragraphs down the article, there's a link to another article, "More than One VTA" which explains why SRA matters more. I never got to adjusting my SRA using a camera microscope, but I do it by ear by adjusting arm height until I get the best sound. Hope that helps.