Hi Ian,
I am not technically savvy so I can't dig up the thread, but no you do not need an AA with BO, BO has AA properties. I did not take an AA with BO and I gained 2 cup sizes. All that said, I don't think taking an AA will be much benefit but I also don't know if it will be a hindrance either. Someone smatter than me can probably tell you how to search for the thread concerning BO.
I know I one of the reasons I started on BO instead of other methods is because it didn't need a bunch of othe things to make it work, it's like a magic little pill that naturally holds estrogenic properties.
It probably wasn't the answer you were looking for but it's what I know from experience. Bo is a marathon not a sprint.