Sorry OP--just a little aside here in your thread.... :(
"If I had 200AMPS capacity in my battery charger it will still only show around 53AMPs which is determined by the batteries internal resistance I suspect."
Roy, the batteries at 440AH will accept over 160 amps at 50% no sweat. They will not demand anything, only accept what they are given.
Your charger as installed, seems to be limited to 53 amps at 14.4 volts. Adding more batteries will not somehow over- work and fry the charger!
If you want more on all this, I recommend you start a new thread.