Hey Kev, a long time ago i released a free ebook on branching anagrams, i think it was called A Beginners Guide To Progressive Anagrams, I dont have a copy anymore due to laptop viruses (and im also working on a definitive guide - definitive yeah right!) but im sure you will be able to find someone who has a copy. It was given out for free and anyone who has a copy is oblidged to pass on a copy to a fellow magi if they feel them worthy of magical secrets.
If you cant find a copy ill give you as much help as i can, they can be tricky to pull off but once you have the right presentation down then they slay the muggles
(Have you tied the psychological approach? Noty recieving letters out of the mist but reading their facial expressions to get the letters?)
Art