I think the problem is one of memory or recall since you are conscious that will predominate in your memory, the astral projection memory/experience will have a hard time overcoming the conscious memory. You could be successfully astral projection while consciously walking around, but since you don't remember it, it would be as it never happened. Robert told the story of while using his astral sight while meditating he astral projected and both he and the projection could see each other and there was a feedback loop of sorts that was disconcerting. He wasn't aware that he had astral projected until each of them locked eyes so to speak on each other. It was the feedback loop that allowed him two have two separate memories of that one incident. One seated and meditating and one hovering in the room and seeing himself seated. Absent the feedback loop you probably won't remember it.