Beyond moving the rest you could dlook at one other problem that a fellow shooter noticed with me. When you shoot your field tips are they going slightly left? Even 1" or so on a few shots? Punching the trigger will cause a person to shoot left. What is only a small issue with FT's can be a big one with BH's.

Also, I'd forget about grouping BH's. You could besubconsciously moving the bow at release to avoid destroying arrows and BH'swhich willcause poor groups. I do it all the time even with FT's. Instead, I'd shoot 1 arrow at a time at different points. Just my $.02