First, let me say I love nUI+, and I recommend it to everyone I have an opportunity to. I've only had one person outright say he didn't like it, and a handful say they liked it, but they preferred their layout at the moment and might try it again someday. Excellent! Keep up the great work!
I like the sorting by raid group, except that nUI shows them like so:
...with group2 like so:
It seems like it would be more logical, and easier to keep track of if they were sorted into columns like so: