firstly, your reading it completely the wrong way, i didnt say that you couldnt do it, i said that you have to be 100% committed 100% of the time to maintain a bf as low as 4%...and even proffesional body builders give up at some stage, as it just isnt possible. think about it, they do it as a proffesion, you on the other hand, have a lovely mrs, 4 lovely children which also take up most of your time surely.
I dont know alot about depression, so really cant comment, but seeing the way you are, and the way you "throw" yourself into things, i would hate for you to set yourself an unachieveable goal, and not be able to reach it! i know what you will think...you will think you have failed, and that will send you spiralling!!!!!....you set yourself a wonderful, achieveable goal, you have done fantastic and nearly achieved it, you look great, why cant you be pleased with yourself, and just think "yes i have made it now! i look good, i feel good!" plus...you already have it sussed on how to maintian!