The smashing success of the first recipe drove me to try and reproduce it about a week after the first cake. Although it was a while ago I think the two things I did differently were using tinfoil and redoing the coals. I think I was at 4 on the bottom and 18-19 at the top but there may have been 5 on the bottom. The tinfoil was used to help with the cake flip which came out perfectly this time.
I guess I added far too much nutmeg in this batch. Instead of a subtle nutmeg flavor it was overwhelming. Maybe the tinfoil kept too much nutmeg out of the bottom of the pan? If I do this again I'll probably do half the nutmeg in the batter and none in the topping.