but I have never tried adjusting nock to each vane position.
I can't speak authoritatively on it since I've never personally done it, but I would think this would kind of lead to the same thing as the old wive's tale of aligning your broadhead blades to your vanes for better arrow flight... In other words, I just don't see it making a difference. But hey, what the heck? Give it a shot and let us know how it works out!