Dear James,
Just a few ideas for you to play around with when you have nothing better to do.
How about cutting the back half of the house in half with the atrium. The atrium would bisect the balcony, with double doors leading to the balcony on either side. The atrium would also contain the stair way between floors.
Another idea would be to extend the living space under the balcony and then to use full height glass walls to improve illumination.
Regards,
Bob