Ryan: Good stuff!
I've just found this site today and am working thru from #1->... and, while there have been some good ones so far, all of yours have all the elements working. (6 years, 6 months ago)
Quizzle: I know. It was an ambitious grid to create. The last group was a bit awkward. ()
Tortoise: There is a ton of ambiguity if you try different kinds of (rot13) FLZZRGEL for one of the groups, as I did. ()
Quizzle: Apologies, didn't realise the same answer appeared in two groups. ()