The products work quite well, when fixed up with the proper set up, don't be so quick to blame the broadhead themselves, NAP recommends at the least 55KE for the Spitfires to open properly, and like stated before I would most likely use them with a setup producing 60KE or better. I use Rocky Mtn Snypers, probably one of the easiest opening mechanicals, Spitfires are known to be one of hardest opening mechanicals. I can tell you, I have had no problems with my setup. Go back to what works, whether its Thunderheads or Muzzy's, but don't blame the product for for a misfortune, there are many things that might not have been noticeable to the human eye, that could have happened in those 16yds. This is why we hunt, not kill, because sh** happens!!!!!!