It was at this moment, feeling the heat of the print surface, that I had a small epiphany and decided I would try one last ditch thing in order to try and defeat the long-print-time heat creep that seems inevitable with all-metal hotends and PLA.
I glued my bed well, and decided to try printing... WITHOUT THE HEATED BED TURNED ON!
![Shocked :shock:](./images/smilies/icon_eek.gif)
I know, shocking. However, this seems to have solved my jamming issue. My only hypothesis as of right now, is that running my bed at 70C was enough to create warm air, which kept the Prometheus V2's heatsink and fan from doing their job properly, allowing the PLA to eventually jam in the coldbreak.
I currently have a gauntlet of a 21 hour PLA print going right now. It is a top piece to my 3d printable cello, and we shall see how well it comes out, or if it jams.