Looks awesome! I wanna see what sorts of fruits you get off of those! I got some golden teachers close to fruiting.

Looks great - The top probably won't ever finish because the vermiculite is acting as a barrier for the cake, so don't worry about it. I don't see the white balls you're talking about but those are most likely pinheads forming. It'll be really obvious in a few days what's going on. Keep it up!