I do suspect the extractor is too tight. One guy fixed his by removing two coils from the extractor spring. Others have shortened the pin. Others have created a "ramped"/curved edge to the guiding edge of the extractor.

Since mine SEEMS to be improving, I'm going to put another 150rds through it and see if it doesn't "break-in". I bought 50rds of WWB, 50rds of Federal Brass, and 50rds of Winchester "Practice". I also grabbed 20-25rds of Winchester "Defend" and 50rds of UNDERWOOD XTP +P.

If all of that doesn't break it in to 100%, I'll cut off 2-3 coils of the extractor spring to loosen it up a bit (and buy a replacement JIC).