C. Should we leave water out all day considering how they are not doing so well with the whole pee-pad thing and only serve water during mealtimes and after play?
Just to let you know, don't limit their water, it can cause bladder pretty bad bladder infections and irritation etc. Good luck, you have a very nice setup and your babies are both beautiful. Wish I could help more, but it looks like everyone has lots of suggestions 
, so good luck!!!