No thank you
This is Kawaguchi Hidetoshi. This is my humble answer to the question.
In fact, I've wondered a long time ago about the question of what is “right” in the “Eightfold Path.”
It's something I wrote about eight years ago, and there are a lot of embarrassing things I would like to revise/correct/supplement, but please take a look at the contents of the following page.
Book “Buddha's Path” Chapter 7 “The Eightfold Path and Middle Path”
http://www.hide.vc/hotokenomichi7.html
Here, it is written that “correct” is a “middle path” without prejudice, discrimination, or arbitrariness, but even so, I know you might feel that it is ambiguous or abstract.
Also, if you argue and define it as such, and it is said that it is not your subjectivity, prejudice, selfishness, self-convenience, or complacency, it will go that far...
Now, when it comes to what correctness should be used as the basis for correctness, I also think that it must be based on the teachings of the truth by Nyorai and Kakusha, as the four-dimensional Hokke Tower said.
Also, I believe that by putting those teachings into practice, we must move towards definite enlightenment by walking the unmistakable Buddhism.
However, since Shakyamuni has already died out, and there are currently no Buddha or sakuji in this world, it is necessary to search for the teachings of the truth by relying on Buddhist scriptures, scriptures, or treatises compiled by the disciples in the later generations of Shakyamuni.
Also, as the other name for the “Eightfold Path” is called “Nakamichi,” I believe that thinking about what kind of situation “Nakamichi” is also important for understanding what is “right.”
If you are further interested, I think it would be a good idea to learn the details of Master Ryuki (Nagarjuna)'s “Middle Discussion.”
Kawaguchi Hidetoshi Gassho