Re: I need patience I think?
I think you probably have good flows now so I think you just need a little patience. I would move the empty frame in the bottom box towards the center a space or two to get them drawing it out. Many times when you add a super, the'll leave the outter two frames in the bottom box un-drawn or just partially drawn, when you are using 10 frame boxes. The bees will crowd the bottom box before they start drawing above, so give them a bit more time. I'ts only been just under a month since they were a nuc, I think it sounds like they are doing well.
20+ years, raise my own queens, feed when needed, I treat but have not perfected varroa management yet.