The BH' s are fixed, not mechanicals. The arrows not be being spined correctly makes sense too me. I don' t get any noticeable fish tailing, but I know maintain a fair amount of consistancy with my BH shots. I have been contemplating the idea of going to carbon arrows. I am going to try the whisker buscuit next year. I guess I' m trying to convince myself that I don' t need a new bow.