I moved the nock point from 5/8 to 3/4 and that took care of the tuning issues. I’m shooting 27 1/2″ mfx 500 shafts 44#@ 26″ I shot every broadhead and field point I had out of the bow ant they all shot right on spot from 125gr to 190 gr. Thanks again for a great bow and that’s coming from someone who’s owned a “bunch” of them over the past 60 years. ~Butch