Mr Mole
I thought that the whole point of putting 12t of fuel on board was to take that freight (you say that is also ballast) on it's way, all be it shoved up at the front. That is the same for any cargo, hence the trim sheet!!
You are not suggesting that, in addition to the cargo, the crew takes additional ballast to trim the ac? Chicken and egg theory developing here.......what came first; the ballast or the fuel?