They are probably a little to low on the annealing. Looking at the annealing line on new Lapua and ADG brass, their line is higher on the case body. Most are right at the case/shoulder junction, or just below it. When I anneal, I try to keep my line above the shoulder by how I direct the flame. I've also had some issues with some brass that the annealing makes the brass very soft, and is hard to not crush the case. If you have higher neck tension, you can crush the cases.