zilla battery draw curtis

I have a Zilla and a Curtis 1231C. With the Zilla, I can pull 1000 amps, the Curtis 500 amps for a short time. I have a 144V, 225AH Trojan 6V pack. I was told that the pack should only discharge at around 2-300 amps. I really want to go back to the Zilla, can anyone give me advice that simply...