The fact is, we experience will as a causative act specifically from our view of it. This does not mean that some mental weather prediction machine could not say while watching our neural storms and currents that "he will decide x" an instant before we take outward action. Causation that the machine sees would be utterly incomprehensible to us... subtle patterns of unfathomable complexity changing ceaselessly and faster than the blink of an eye. Causation we experience might be "this qualifies as that which implies p so I decide x". Is this some kind of dichotomy? Is it problematic that we have the unique point of view to allow us to see causality happen from an intelligible framework rather than a hopelessly complex one? Electrons and nuclei of atoms are fundamental to low and high pressure systems but we don't need to dismiss the idea that rain is caused by low and high pressure systems(with humidity as needed). It would be a mistake to say either pressure systems or particles are the cause. Reality and causation are not schizophrenic.
Your mind causes, and it is arranged such that thoughts ARE causative. We don't need to see proof in the hopelessly complex brain all we need to do is introspect and act. Atoms do not think, they make it possible for us to think.