Despite they were very detailed instructions it took me a while to get it 
But It worked like a charm.
I want to make clear what happened (without I’m like a little donkey)
At first I understood what you said here:
“The Path needs to start and end perpendicular to the desired face orientation.”
I understood your statement, but I didn’t thought it was possible situate the circle edges that way, so … I made one quarter of the circle, I exploded it, and I use autofold to move the last edges to make 90 degree. That’s why this shape doesn’t look like a real arc 
While I was following your instructions I wondered how you knew I need to rotate it 7,5 degree.
Repeating the process I realised that if I work from origin it also tells me when the midpoint of the first edge intersects the green axe.
Now before this post I also did some basic maths with the calculator, 360 / 24 = 15, so each segment is 15 degree, one half will be 7,5 
But I agree with what @tuckejam says here:
“Sometimes it does exactly what i want,
sometimes my shape is inside out (revers faces)
sometimes it starts behind the beginning of my line then skips a section and then continues on fine.”
I was doing some tests yesterday to understand a little bit follow me tool with some successful, I also did some tests today to understand better what was happening, but it seems I still have some troubles understanding the tool.
DaveR I apologize for the time I stole you with this question 
Thank you so much as always.