If your broadheads were hitting to the left and then started hitting to the right after you moved your rest, it sounds like you overcorrected. Move the rest back away from the riser ever so slightly and try it again. If you got that much movement the first time you should be able to find the sweet spot.

I have been known to resight in for broadheads, but only when I was totally convinced that the broadheads were flying perfectly and grouping well at all ranges. Now I will tinker and tinker until they hit with my field points since then you KNOW you have a perfectly tuned bow.

Good luck! ...Shockwave