There is something I don't understand. The third quoted line should raise an entirely different question. You are in the position where you want to constantly

There is something I don't understand. The third quoted line should raise an entirely different question. You are in the position where you want to constantly hire a lot of qualified candidates. If you have discovered a way to decrease false negative rate, why would you not apply that across the board? It's like you have learned how to fix hiring but then carry it out only with some arbitrary cohorts. Sounds irrational to me.