I really liked the letter....it makes a lot of sense and addresses the issues you are facing with your exH.
I too am tired of being the object of their wrath. Ummm.....aren't you the one who chose to leave? So then why is this all my fault?
Glad that FFG is coming through for you. You are a pretty strong force of nature from what I have read/heard/spoken with you, so the powers of you and FFG combined are no doubt a sight to behold!