What does your headspace guage read now? Running the numbers, a move of the barrel from 12:00 to 2:30 extends the headspace 0.010".
I'd prefer to be on the short end of headspace, than long. I anneal and FL size my brass every firing. So, I set my headspace a couple thou beyond that. Running with a long headspace may be an easy fix for your issues, but may not be the root of your problem.
Did your service center check the primary extraction? That is a known cause of your issues, and occurs more frequently than headspace issues.
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