CB Range discussion

It’s been four days since I started getting accustomed to my new CB6kS. I’m currently using the middle ring with a short spacer, which feels like just the right fit for me. However, there is some discomfort near the bottom of my sac. It also seems to occur when I step up to the larger ring. The issue is definitely at the lower part of the ring. I can’t quite tell if it’s merely irritation in my taint or if the sac itself is involved, but it feels more like a skin problem even though there are no visible hot spots. Will sanding down the ring help resolve this, or will I just have to get used to it?