First of all, Correlation does not imply causation.
Remember that you changed more than one variable (and then your problem didn't start immediately), so there could be other causes. The fact that your problems did not immediately surface gives credence to the possibilty (not certainty) that it could be an issue unrelated to the trigger.
If it were I who had the problem, I would make sure that the firing pin's forward movement was not impeded in any way by a buildup of dirt, grit, or a particle of schmutz that worked its way into the bolt.
Have you measured firing pin protrusion?
Have you tried going back to your original ammo?
It could possibly be a headspace issue or ammo sizing issue.
I am sure that there are other possibilities....let's see what the experts have to say (I'm a rank amateur).
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