I still say it looks like a material defect or hardening defect of the cam. I've thought about it a bit and if it were a spring issue, I would think the wear pattern would look like, well...a wear pattern, and not a pattern that looks like a hillside when the soil erodes away. I would contact Butler and see what they think and see what kind of assistance you can get from them in dealing with the cam manufacturer.
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Just a blind squirrel looking for a nut.
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