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The brass is once fired. I bought the brass new as factory loads and this is their first reload.
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You bought new factory loads, fired them, sized them and reloaded and fired them, right? To me that means they are fired twice. How did you set your resizing die to properly set the shoulder back the correct amount?
I have found excessive head space to cause flat primers when pressures are normal.
The second picture looks more like and indentation, not a high spot. If it was caused by high pressure extruding the primer into the ejector, it would be a high spot.
What type rifle are you shooting? Is the ejector the mauser type, or the Remington plunger type?