There is section on broadhead tuning in the Easton tuning guide.
http://www.eastonarchery.com/pdf/tuning_guide.pdf


This will help you get your broadheads and fieldpoints hitting the same spot but broadheads don't fly like field points.They fly like they have blades on them. Meaning,they are a little less forgiving to form flaws and wind planing but getting them tuned to hit with fieldpoint is usually not that big of a deal.SOMETIMES you can get a bad head that won't tune or a bow that doesn't want to shoot them tuned to the same poi but they are few and far between.

For them to hit the same poi.The arrow spine has to be spot on and you need decent form and adequate steering from your fletching.