I've just made a rugby ball cake for saturday, its my first rugby ball but previously I've done a couple of footballs. With the footballs I didnt use any support and by the time it was picked up it had a very flat bottom as the weight had sagged down a bit. This time for the rugby ball I put dowels and a board in the middle of the cake, so that the top half wouldnt squash the bottom half, but the bottom just seems to be saggin of its own accord. Its not even that big, its smaller than life size. Can anyone tell me why its doing this and how I stop it in future? I cant understand it, I've seen LOADS of other rugby ball cakes that all look perfect! 
