Have to chime in here as I also experimented with Thorn Broadheads in 2019. Based on their pre-deployed configuration and all of the ads/ video reviews they looked to be a no-brainer for great arrow flight. In my experience that is absolutely true - they fly like darts out to as far as I care to shoot at game. However, I’ve found the performance and penetration on game abysmal.
My 450gr arrows, flying in the 290-300 fps range are almost always full passthroughs with most other heads. Not so with the Thorn - and the blood trails were less than other heads I’ve used. The worst experience was on a Sonora Mule Deer. Don‘t immediately recall the exact shot distance but it wasn’t far. Deer was relaxed and slightly quartered away - perfect angle. However, immediately after the shot I was stunned to see the deer running away with most of the shaft sticking out of his near side. It was early morning when I shot, so we gave it 5 hours before following up. Tracking was absurdly hard with a very faint blood trail. We tracked a very long way and the there was no sign of him laying down. Was about to back out and wait until morning, when we finally found him - expired. The arrow had only penetrated 8-9 inches with a very narrow entrance wound. As far as we could tell, outside of clipping a rib there was no explanation other than broadhead failure or design flaw. I’m convinced that if I were using my QAD Exodus or Rage Hypodermic the results would have been quite different. Used them extensively and virtually all passthroughs with good blood trails (unless I hit the off-side shoulder). I’m done with Thorn.
My 2 cents - Zac may have made a marginal shot but in my experience the Thorn Broadhead likely played a complicit role in the result.