I shoot my broadheads out to about 80 and 90. The slick trick standards fly the best at that distance, followed by the mx3s, then the grizz tricks. All start hitting low at those distances, but are dead on to about 70-75. My thought is that there is increased drag on the front causing them to drop at lower distances. I have no issues other than hitting a little low. It also may be a slight d-loop adjustment that I need to get them exactly right, but I haven't taken the time to figure that out. I put a lot of time into squaring ends of arrows, making sure there isn't any wobble in the heads when I spin them and all that. If you do that, I don't think any shoot that bad. A tuned bow is a must though.
I also used to shoot the mx3s out to 100 with my older bow, but it was a lot more of a forgiving bow than I have now and wasn't as fast. Had no issues back then, so I know they have the ability to fly good just depends on your setup.