I just thought about something else, not directly related to the OP. But tangentially related. Those of you who have brass throwing Glocks and also non-brass throwing guns. Have you ever tried slipping a fired case between the breech face and the extractor claw to see how loose it is?
I wonder if having a claw that isn't pulling the case tight against the face could make the ejection inconsistent?
Just something that came to me as I was walking the 1/4" mile to the bathroom.
I'm going to check mine sometime this afternoon. Of course, it is my wife's birthday so maybe tomorrow.