I like option #3.
Option #2? Never file, shave down or hone your firing pin. You want that firing pin to hit the primer hard enough to create ignition of your cartridge.
Option #1. Not sure if this would solve the primer drag.
I have a Sig P-365, it has some primer strike drag. My Glock 43 also does the same.
A co-worker who has a Shield mentioned to me that his also leaves primer strike drag on the primer.
I'm not sure it is a major problem or any problem worth worrying about.
On some Sig forums, they've mentioned that it was designed that way and other have mentioned that the Sig company has responded to their questions and complaints over it.
Sig's statements or response was that it is perfectly normal when firing small micro size firearms.
When I purchased my 365, I was warned of all the failures. To this day I've not had any malfunctions, no exaggeration, not one failure. I shoot left handed therefore eliminating the thumb over the slide lock. I've not had any failure to fire, failure to feed, failure to eject, no stove pipes.
My 365 has fired everything I've fed it in different weight grain or brand of ammo, including reloads.
I had never heard of the primer drag before and I don't think it was ever a problem until Sig came out with their Sig P-365.
Seems too many people out there wanted the 365 to fail and since there was nothing to complain about they cooked up what ever they could to make sure no one went out and bought one.
Today there are so many micro guns and more companies making them because it is what many of us like in order for concealment purposes.
Even Taurus jumped into the game and came up with a G2C. Crappy trigger but great gun.