Another easy way to get HUGE fights is to make it so that, on a large map w/ 10 AI, make it so that there's 1 Vicious and the rest are either Hard or Cruel Ai, and then make it so that there's no AI in the system you start out in.
Once you take the whole system, you should have supermassive slugging matches w/ the Vicious AI for control of your system.
Richter {^}