Mainah77, I' d make small adjustments to your rest and nock point, trying to move your broadhead groups closer to the field points. Example, if your broadheads are hitting low, lower your nock point about 1/16" at a time. If they' re hitting left, move the rest to the right 1/16" at a time. You should be able to get them damn close.
Broadheads catch air when the arrow flexes, they have a different FOC due to their slightly longer length than the field points, and they create a little more drag.
But' s lets be honest here, if you are asking this question, I doubt your a pro shooter who can see the difference, so I' d say you should just worry about getting them close together. Then as you practice and improve, you can group tune for broadheads. I doubt you' re tuned so well that you' re actually seeing the difference in broadheads, most likely you' re seeing the broadhead planning because it' s not coming off the rest exactly straight.
I can always get my broadheads and field points hitting the same spot, but then again, I' m not the kind of shot some of these guys are, so maybe I' m not seeing the small difference they see