Let me try to get what you're saying: That since I can't remember making those decisions it wasn't me who was conscious while I was doing so? It was somebody else? Well, I suppose it's possible, but regardless of who was conscious at the time it was still my body, my biology and even neurology performing the actions. So if everything's biological how can you defend the idea of some other conscious being invading my own brain? That would be a real materialist no-no.
I'm not exactly trying to attack your assertion, I'm trying to change the way you see it. A good way to define consciousnes is as a link between emotions and experience. Since our experiences have so much to do with memory, as in how we choose to react to a certain situation, what I hear you saying is that if we seem to be reacting to a situation differently than we normally would, we must not be experiencing it with our normal conscious self. I don't think this is necessarily true. If it were, wouldn't there be some sort of
final memory, like in the "blacking out" case, where you were
last yourself, right before your actions became posessed?
Since you cannot trace back to such a memory, the reason you don't remember probably isn't a problem involving a self-departure. Rather, it's probably just because of a problem with memory. You could have been making decisions, fully conscious and lucid, but simply not storing the experience in your memory. Almost like a dream. Do you think that someone else dreams for you too? I wish I could live like that conquering consciousness for a while, and get to have people's dreams and be drunk for them! And then
they have to wake up with a hangover!
You're supposed to be the pragmatist, remember?