It sounds as though the action has too much primary extraction, the PE cam and the lead in ramps are in conflict. The lugs are trying to follow the ramps to lock the lugs to battery while the PE cam is still engaged. I forget the exact numbers, but about anything more than .100" is too much, .050" too little. I shoot for middle, .070"-.075".
You might want to try the original factory bolt handle to see if it makes any difference.
Bill
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