If your bow is tuned {center shot}. I will put money on it that it is your rest. Those wisker basket rests aren't very good when it comes to strait arrow flight. Once your arrow is released and slightly touches something in flight,unless your centershot is perfect those wisker basket rests will make eratic arrow flight. you may not notice it with field points but you will find out when you put a fixed blade broadhead or even a mechanical head on.

"Give me spring turkey season or give me death"