You cannot discharge A123s to 0 volts, this will surely damage the cells.
30C discharge rate is very inflated for A123. They will not hold their voltage like you claim under that load.
You cannot 'zip charge' a 2S2P 2200mah pack across a 12V battery.
Here are some graphs that show A123 discharges
http://www.rcgroups.com/forums/attac...mentid=1948092
http://www.rcgroups.com/forums/attac...mentid=1948928
You can clearly see that at 80A, the cell doesn't even come close to holding its voltage. At 50A discharge under a cooling fan, the battery reaches 145F, this is 20A less than its 'rated' 30C. Seems like A123 Systems over-inflated the current capacity claims.