I think that this isn't very good "decision theory for humans, a project I have been working on informally for years. The best decision theory for humans for a particular person probably usually amounts to something very much like a virtue ethic, though not always the same virtue ethic across people.
Whatever you do, the more closely you adhere to a model rather than to tradition, the more confident you must be that your model is exactly correct, and "I am a unitary uncaused decision-making process" isn't very close.