Then you will really enjoy the work of Daniel Wegner. Most of his research is summarized in the book "Illusion of the Conscious Will". His main argument is tha

Then you will really enjoy the work of Daniel Wegner. Most of his research is summarized in the book "Illusion of the Conscious Will". His main argument is that we have two causal models to understanding the world, direct physical ones and "agent based". The first is good for figuring out a thrown rock is about to hit you and the agent based models are important for understanding things like a tigers sneaking up on prey. Wegner proposes that when we apply this agent based model to our own actions we come up with the illusion of a conscious will. This is essentially the same as your post-hoc justification.