When you configure the CA you only input the amount of cells in series, not the total cell count. So for three parallel connected 16s 10Ah batteries you should input 16 cells 30Ah. If you do use 3 packs you'll also notice that the internal resistance will be 1/3rd.
I have been searching throughout the web for a good 48v battery for my bike and I have actually found that the GM battery is the best battery with a metal casing, that I can find. There are better battery cells like A123 systems and headway, but they are all shrink wrapped and never in a nice metal case like the GM and several worse batteries.