That is true hopefully the BH flies pretty close to your field points. If they do not you can do several things.
1. Find another BH that does fly similiar to field points.
2. Sight your bow into what your BH flys
3. If the difference is not too extreme modify your shot placement to accomadate the difference in field point and BH .
I think I would go with # 1 myself. Because then you do not have to constantly be concerned as to the way you practice and hte way the broadhead is shooting. If the difference is minimal then you can apply #3 choice. As far as braodheads that fly similar to field points, you can find suggestions on several on this web site. The ones that I personally would suggest is if you like mechanicals is the "Rage" and in the fixed blade is the Slick Tricks 100's Standard Blades. Just my opinion. A lot of people have otehr suggestions as well. Just that these have impressed me