I don't think you will have success with your idea of setting back the barrel, there won't be enough of the flange left; the extractor cut would have to be re-done, in addition to re-cutting the chamber.
What you need is a different bolt, or front toggle if the head space closes on a "field" guage.
Looking at the picture, though it may be a shadow or the angle, is the extractor broken? Allowing too much movement.
Have you had the extractor out to see its condition?
What ammo are you shooting?
How did you arrive at .776 as the headspace?
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