Polder, what I know of AZO is that it is very slow to expose--it is primarily used as 'contact' printing paper as it is mostly ultraviolet light sensitive. This makes it difficult to use for enlargements. It's not nearly as quick to expose as enlarging paper from Ilford or Foma.
Very nice work Stormpetrel! Such amazing sophistication in your designs. When do you expect to have that LED head finished and tested?