Swede,
I have the same problem, with S&B brass and Federal SP100's. It only occurs with S&B 9mm brass, the S&B .40 is OK, especially after the first time reloading.
The problem totally disappears with Winchester primers. I'm using a 1050 BTW.
Since I shoot a Glock too, I find it strange that Winchesters are giving you a problem in your Glock. Do you still use the original striker spring? That one is critical once you start using Winchester. Federals can be shot with a lighter spring.
Any Glock should be able to shoot ammo with *any* primers. S&B factory ammo runs just fine, while they have the name containing the toughest primers.
You might also want to check the striker tunnel being clean / the striker not being hampered in any way.
cheers
Oleg