If your'e shooting inconsistant...this has nothing to do with the type of "arrow".
IF...you were shooting "the same arrow"...consistantly low..right/left...high..what-ever...but consistant...then I might agree...try a different arrow combination.

BUT...you're saying inconsistant...I take this as the arrow is ending up all over the target...is this correct?

If you have double checked that the riser is tight on the stock....I'd look seriously at #1 or #2 from awshucks list of posibilities...in that order.

Try a rope cocker and tell us what happens..before you jump to too many conclusions and call Horton. Try these options first.

Mike