Over the years I always had issues with flyers no matter what arrow/head combination I tried. Seemed like I would only get about 8 or so to group together out of a batch of 12. I switched this year to Victory Xbolts which are spine aligned. Problem solved. I’m using regular Muzzy 3 blades, 100 gr. I literally just screwed them on, adjusted my scope and was in business. They all group together and fly like darts.