between the bow's holding weight at yer draw length, and the dynamic spine of the bare arrow shaft that flies well and lands reasonably straight in a bi-directional butt, the movable arrow nocking point will address "porpoising" (up/down).
"fishtailing" (left/right) is about the arrow's dynamic spine and what amount of arrow paradox is required to clear the shelf, as directed by arrow shelf's pressure point location with regards its distance from the bow's centerline.
it's good to have a number of varied spine weight bare shafts that are cut to your arrrow and draw length, and screw-in point weights on hand for arrow shaft selection. most stick bows will be limited in their built-in pressure point (that can't be moved, or moved very little), so between the shooter's inherent unique variables (consistent draw length, good release), and the arrow's dynamic spine, one spine range shaft and one point weight will yield good arrow flight and butt strike at 5 yards, and then 10 yards, quite well. literally, it will fly almost as if it was fletched.
then tune out porpoising, if any, with a string nock point up/down adjustment.