John - you really should not be charging your FMA 4800 at 10 amps. Charging over 2C really kills the cycle life even if the manufacturer claims that the cell can handle 2C. Both capacity and internal resistance takes a bit hit and you get this odd crystal buildup when repeatedly charged at 2C. The battery actually degrades more during a 2C charge than a 20C discharge.
Attached is a pic of what happens to a lipo when subject to a 2C charge. It was dead in less than 200 cycles at 2C, but was good for over 1000 cycles at 1C.