Interesting to see your figures.
I had just been reading a response that AICES (Association of International Courier and Express Services) submitted for the consultation on night flights which gave the impression that new A380 planes were well short of freight capacity :
The Government should take into account in forward planning the pressure that will be put on bellyhold express freight at Heathrow as a result of the move to A380 aircraft. These aircraft could actually restrict air freight movements and lead to movement of materials and associated jobs and infrastructure to other European airport hubs. Despite its significantly greater size and passenger carrying capacity, the A380 has around 50% less cargo carrying capacity than a Boeing 777-300 which is currently the optimum aircraft for carrying bellyhold freight. For example two 777-300 aircraft carry the same number of passengers as one A380, with up to 18 canisters of freight whilst the A380 carries only 4 of the same size cans. The Department needs to consider the impact on express of such a change in aircraft usage given the potential impact on the wider economy.