Metabolism of cannabis cannabinoids is very different from that of endocannabinoids. That said, I don't think I ever really paid attention to whether nutmeg affected the subjective strength of cannabis during any of my experiments. At present, that's something someone else will have to look into.

The cacao/anandamide question is very interesting. Today the Missus specially pointed out to me where she had put my cacao stash - it seems like this was a sign. Caution is necessary if experimenting with combining nutmeg with cacao as both of these plants can be hard on the liver.