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@arup
I was having the same problem and then upgraded my chainring. I have one of those Thorn 1/8" chainrings from SJS. Things improved but the problem is still noticeable. I worked with the chainring "truing" idea ie tensioning the stack bolts gradually. A bit more improvement but still noticeable. So I'm wondering if it's to do with the cranks. Perhaps the crank arm spider is pulling the chainring out of true. They aren't proper track cranks.