I put the new HBI trigger and new striker spring in this morning. This is all I'm going to do to this, so I'm calling it done for now. Both the factory trigger and the HBI have {had} a really nice break.
Edit; After looking at the picture of the barrel where recoil spring seats I had to break it down. The picture looks like the steel has a fracture in it. It was just a little oil and optical illusion. It did kinda freak me out when I saw the picture though.
Factory trigger with 10 pull average:
HBI trigger and striker spring 10 pull average: