RE: re-tune?
They are, Roskoe. Tuning is adjustments to the bow, arrow and rest to achieve clean launch, good arrow flight and consistent accuracy. Then you adjust the sights to make point of impact and point of aim one and the same.
Apples and oranges... but you have to have both in order to make fruit salad. You have to have a well tuned bow/arrow combo and well adjusted sights to make your arrows consistently hit where you want.
But you can't forget the shooter has to be tuned too. Practice good, repeatable form.