Thanks for follow up....we get curious
When you had it apart did you do any smoothing of the parts that move during reset. Careful smoothing, with no metal recontouring or removal, followed logically with a bit of polish might be your answer. I know you at least looked that still over .... you did right?
I have no answer other than to note that every pistol, all types, I have smoothed and then half heartedly polished was improved. Other than a bit of time it is essentially free too!