It's a tuning issue and if flight is erratic from one arrow to the next (not grouping) then it's an arrow tuning issue: underspined/overspined, rest/riser/cable contact, broadheads not aligned with shaft... Get the arrows tuned up and then get the bow tuned up with them. If you're grouping field points well then you're beyond papertuning at this point. You need to get the broadheads grouping and then you can fine tune them to impact with the field points with minor rest adjustments.