I'm curious about how responsive newgrounds VAs are. I have contacted about 5 VAs and so far HaruLuna is the only one replying and doing so everytime less than a day.
Has any of your VAs you're trying to contact, replied to you?
I have only contacted one who is not comfortable with the content of this game.
I think HaraLuna is active because she maybe very popular for NSFW voice acting (I recalled I have seen that name before). I am yet to contact her but will do once some work is done.