S&W has had a lot of borderline too short firing pins for decades, going well back into the hammer nose years. It sounds like that is the problem in this case. S&W will not put a longer firing pin in the gun, even if that would fix it.
I prefer the Power Custom extended firing pins. One of those would likely help a lot.
Scooter123 has good advice about making the tip of the firing pin hemishperical. That shape works the best for reliable ignition.
Steelslaver has good advice about headspace and endshake.
Others have given various and sundry good advice as well.
I think these are the most likely problems with your gun, judging by the evidence. No one can say for sure without the gun on their bench. My opinion is worth every dollar you paid for it.
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