I don't remember ever saying it but it is true that weight toward the center of the string will cost you speed and weight out at the end MAY increase speed.


I have never seen a gain with leeches.


I have seen speed balls or nocks with shrink wrap around them gain a few fps. when installed out toward the ends of the string.No more than 5 fps though.



There isn't an archer alive that can tell the difference in 5 fps.Maybe at 80 yards when sighted in for a lighter arrow.