Hello. If the mainspring feels strong enough...and you'll know and you've cleaned the firing pin channel, etc, it leaves two possibilities: the ammo and the firing pin. I don't know what ammo you are firing, but you might try another brand, preferrably made in America where we know that there are fewer "hard" primers or defective primers. I would also trust Fiocchi. IF the problems go away, it's ammo-related. IF not and if you're sure the mainspring is strong enough, get a new firing pin and compare to what you've got right now. Perhaps yours is chiped or a bit of the point broken off? They're very easy to change and if it's not the problem, you have a spare.
Best.
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