Also, there is no need to align the blades/fletch...I've never done this and like above, with Muzzy's had pinpoint percision.

I didn't notice anyone mention tuning your arrows to make sure there is no broadhead wobble. Misalignment with your inserts/broadheads will cause the broadheads to plane differently. That is why your probably not getting groups as well as a mistuned bow. The blades of a broadhead will steer the arrow. If the arrows are coming off the bow oddly, the broadheads will steer the arrow all over the place.

It's really not rocket science, well sorta but if the bow is tuned, the arrow is tuned, the broadheads will group. Perhaps not exact POI as field points but either a minor sight adjustment, or minor rest adjustment and your ready to go hunting with broadheads.

I also recommend at least a slight offset as mentioned above too. With 2413's and a prong/shoot through rest, you should have ample spreadage to use an offset.