I don't know what other fictional universe you mixed up in there, but you did do some mixing.
Your two catagories of VI's are actually VI's and (grown) AI's, and AI's actually possess greater potential for technical prowess. Bess-13 and her counterpart are also actually AI's and are not hard...
Well that would be because nothing changes while you're in the nursery except for the pregnancy and the day counter. Balls and breasts won't fill up, and if you're covered in cum when you go in, you're covered in cum when you come out months later.
Now that you mention it, the lack of purely female bunnies is unfortunate, but what can you do?
And that's a rhetorical question, for all you people who are about to say write it yourself or commission it.
While those may be your definitions of those words, those aren’t the definitions TiTS uses. Futanarti and herm both refer to people specifically with both a vagina and a dick, but futa refers solely to feminine body types, while herm can refer to a masculine or feminine body type.