I did finally figure out how to make sure the tops stayed nice and bulbous (be really, really gentle with them as you take them out of the oven and let them cool completely), which made the ganache-ing much less messy this time around. The mousse filling was great (I mixed some extra into some soymilk last night... mmmmm) but honestly it would have been a lot richer with some heavy cream. Vegans!
I overbaked them a little (paranoid about the tops falling) but they were still delicious. 9 Ankh necklaces out of 10.