You're overthinking a simple procedure.
No, I'm not!
You show plenty of pulleys and some appear to have U-grooves while others look to have V-grooves. As I said before, I'm sure both work and likely work well for hobbing, but the simple question is whether you find one style to work better than the other for your purposes???
If you really cannot tell any significant difference, then that is valuable information as well.
BTW, that may well be a record number of photo attachments ..... well done!!!
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