So are you saying that the tension was too tight?
I have a couple PM9s and never had a malfunction yet, and I confess I never checked the extractor tension because they have been flawless. Hope this continues. To add, I use Dawson and a Wilson mags. Tripp mags in 9mm gave me a fit as the top rounds worked their way forward causing a dropped round during a partial reload.
Also, my PM45 has also run like a fine watch without problems. Tripp mags for the 45.