I do a lot of shooting with S&W revolvers and haven't found anything better than the Bang, Inc springs. Brownells has them.
Some guys like to play with different rebound spring weights, but the Bang spring does the job for me. YMMV.
Also buy an extended firing pin. It makes all the difference when you're looking for a fairly light DA pull and 100% primer ignition.
I was surprised by the weakened spring as well. I assumed that tightening the screw would address the problem. But when I tried to it was as tight as it could be. My smith said that the mainspring is rather light and maybe I would want to replace it.
Is it possible someone took a file to the strain screw. This is a common way of setting a lighter trigger pull. Compare the length to another screw in a revolver with good hammer tension.
The length of hammer-mounted firing pins is seldom the cause of misfires. What is more likely is a headspace problem caused by cylinder end-shake, or excessively reduced mainspring tension - for whatever reason. A qualified gunsmith or the S&W factory can cure whatever, and replacing the firing pin won't be necessary unless the tip is broken.
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