Oh boy, lots to decipher here. First I'd give them at least a few days or a week to orient. I'd put the NUC (s), you weren't clear of size or how many (two NUCs in one on a nine frame????, most are four or five frames), in 'one' 8 or 10 frame deep if you're using deeps (I only use mediums so I'd use two) and let them build that out some before adding another box. Giving bees alot of room does not motivate them to expand out into the room you provide without some thought behind it. Then in the meantime, before adding another box I'd do some searching on this site, as some of your questions have been discussed to death pretty recently, such as expanding broodnest and checkerboarding. Diligent research is part of beekeeping and it never ends :-D. Hope this helps, Good luck and keep us posted.