I get the same mark on the right fletch I am shooting a pse dream season at 63# My arrows and b-heads are flying beautiful but I went to a local archery guru and he said the mark is caused by the fletching already spinning and sometimes going through the black part of the biscuit i actually bought a drop away but he told me if things are shooting well don't mess with sucess and the bisquit his quite problem free he says he sees many drop aways that need repaired due to strings catching on brush etc during season and literally no probs w/ biscuits his advice if it isn't broke dont fix it