If you take the time to spin check your broadheads and get them so that they do not wobble, the fixed blades will hit the same POI as field points with a crossbow just the same as with a vertical bow. Some fixed broadheads (like my Slick Tricks) come with an alignment washer to install between the insert and the broadhead that can be rotated to get the broadhead so that it will not wobble when spun on the arrow. If the broadhead does not have such a washer, then the only way to change the alignment of the broadhead is to rotate the insert within the arrow until there is no wobble.