Years ago blazers had a run where they were all falling off. It was something in the chemical makeup of the fletch. But that was like 10yrs ago, and only for a short period.
Agree, it was something in the fletching process... and unfortunate for you. I fletch my own, and the majority are super hard to even cut off. I really like Blazers, they just work.

Keep after him... good luck next go around! Sounds like you've done your homework well, maybe you'll get another crack. Unfortunately murphy interfered this time!