I don't think the different bolt heads has anything to do with it. The places you have circled in red show some deformation of the timing trigger. The eBay one has rub marks on the face of the one set of triggers, yours looks like one of the triggers is deformed slightly, as compared to the 'good' JWT one. You might see if there is a measurement for the gap in the triggers in the FSM (it might be a +/- .001 or so), then measure yours. My uncalibrated eyeball says that yours are spread slightly as compared to the 'good' JWT one.
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