The coil had burned out after a month of heavy usage. Up to that point I hadn't pulled the needle plate. I pulled the plate on my other one tonight and the coil was really gunked up. Washed it out good and did some burns to get the gunk off. It's tasting better now, hopefully it will extend the life by keeping it clean.
I plan to try to rebuild the one I took apart. I hope to have some time to try next week.