"...particularly a point a few years back where the psych screening benchmark was changed due to a lack of people meeting the required grade."
There is no grade for a psych test, perhaps this is where QF are going wrong during the selection process. They dont know what the data is telling them.
Keg, have you considered that QF may not be looking for the best pilot so much as the best fit for long haul legacy culture? Not everyone can spend a decade sitting behind some crusty old ****** calling him sir!