I took mine apart to clean and lube and put back together without a thorough exam but I dont remember seeing much you could do.
I know, I was hoping for something like the centerfire setup.....the shells that didn't go off only had a very slight dimple on 'em. I mean very slight.

I don't think there's any adjustment that can be made to the firing pin protrusion. It's all one piece with a spring at the back end.......weak spring maybe?

Oh well, I've got several actions in the safe and have never had an issue. Guess good 'ole Murphy caught up to me. I'm just glad I found the problem now and not real close to deer season!

Sharpshooter, I could really use your input here!!!