The pics of your necks look good to me. I read an older post about the wavy soot line being what to look for for optimal pressures and best accuracy. I could not shoot the 44+ node in my .308 with those same bullets, got ejector marks just like your seeing. Backed it down to 42.7 and shot well. However, if you had some sort of lube in the chamber you could have been getting excessive bolt thrust causing those ejector marks, I did that once and stamped Lapua 308 on my bolt face, lesson learned.