I'm hoping this will help. It might be that your firing pin has "rounded out where the sear contacts it. The quick check for this is turn your firing pin 180 and reinstall it. So when you take out the firing pin mark the bottom of it. When you put it back in index the mark so it is up. This gives you a hopefully fairly new area for the sear to sit in. If this works, it did in one I help another guy with, you should pick up a new firing pin. Thankfully that part is easy to find.
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