I'm trying to get my magnus stingers to group. About every 3-5 shots, I get a flyer. Generally impacts high. I weeded out one bad arrow that was throwing off even field points. They spintest just fine-zero wobble. I'm using 4" feathers fletched helical and a drop away rest. I'm also testing Wasp Boss broadheads and they are absolutely dead on. I don't want to give up completely on the Stingers, but I might set them aside for this season and use the Wasps. Should I try 5" feathers, different arrow, any suggestions?