It took me a long and challenging time vs 7 AI to finally win http://triton.ironhelmet.com/game/6496331283562496.
I got very few trading windows in between until I KO’d 2 of the AI players. After I KO’d the 3rd AI player, the trading windows became much easier to reach, by which time I was already 5 levels ahead on my weapons sprint, and the galaxy was well in my control. But I do recall that that the AI’s I recently attacked would not trade back even if I gave them enough credits to do so.
Imagine 31 AI’s trading tech, I think you basically have to develop your all your own techs with no AI trading window ever appearing. Or give up some weapons tech from your sprint (a huge sacrifice).
At the time , my brother observed those particular AI’s must have been holding a trading grudge against me. Now I know why.
Just for future use:
Please advise how long (how many ticks) from the last attack, that the AI trading grudge against me would last.
If it lasts forever, then I would suggest you reset the trading grudge to just 3 or 4 pay cycles from the last attack.