Seating primer flush instead of bottoming out in primer pocket can take some energy out of the firing pin strike as it seats the primer the rest of the way when it strikes. I would load a couple with primer bottomed out and test.
What I meant was flush with the bottom of the pocket, sorry bout dat. Anyway I changed out firing pin, hammer ,trigger and stryker assembly. reinstalled original trigger extension which I forged to lengthen a bit. Fired off two primed shells. Need range time to test live ammo although firing pin looks to be protruding more than it was. I am feeling confident.I don't know about this seating primers flush, I learned primers need to be seated against the primer pocket bottom so the firing pin can work properly to fire the primer instead of seating the primer slightly deeper and leaving a light pin strike.