No, double 10AWG is okay for each series connection and two 10AWG exiting the battery (two red 10AWG and two black 10AWG), probably each pair going to its own XT90
But I must ask, 160A continuous at 12S is an assload of power. Are you trying to hit 70mph? Or just beat a musclecar off the line?
Continuous and Peak (or Instantaneous) are vastly different