I've been using a backlog though I've never seen Forster's system, and have found it useful. I'm glad to see it made explicit. I also think you are right on the money in trying to run a middle path between the rigidity of a set daily task list in and the lack of priority in GTD's massive list of next actions. There's a lot of insight here, thank you for sharing. My one criticism would be to add some order to it to enhance readability, it's a wall of text right now.