I had them fletched at the local mathews pro shop. Thats what confuses me. I could group great with them before and now its just frustrating when i shoot.

I am going to go back and re calc the FOC and see what i have. But why would i have to change grains now when they shot great before?? Would changing to a helical change the FOC? If my FOC is bad now then why did they fly good with field tips before?

How could i tell if they were fletched wrong. Anything i particularly should look for?