Hi Nate,
Occationally I pick my scotch bonnets when they are like half ripe because I prefer the different flavor it gives for some dishes.
My half ripe pods are just as hot as my fully riped ones as far as I can tell. I think once the fruit is full it doesent need to be fully ripe to feel the heat and flavor.
Not sure why one of your pods had no heat when it was almost fully ripe, epecially a 7 pod.