While I think you can mess with the mag spring to make it work better, it's not the cause of the problem, and messing with it too much may cause feeding issues. It's been well established that the cause of the problem is the metal wearing down. Older P226s don't seem to have this wear issue, suggesting that newer ones are made of weaker metal. You either replace it with a new part, or file it as the others have suggested.
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