Tomgs is right in his assumption: The AI does not scrap old units so you probably will find the oldest fighters in their core systems. There is no way around this (look at my "remaining issues" list)
The EA would use 20 fighter Groups if only the EarthAlliance_AI_Strategies.txt would work. As I found out all the AIs are using only the Default_AI_Strategies.txt. As all the races uses these files I did not alter this. But if you have a closer look you will find that the EA already has the EarthAlliance_AI_Strategies.txt and will use altered strategies and fighter group once MM fixes this bug.
And for the DUCs: The EA will concentrate on energy stream weapons and does not develop DUCs any further. If the AI in turn 70 only has DUCs it probalby had a bad start resulting in low research or low minerals.
The same is true for carriers. If the AI picks a bad start/starting point then it is just tough luck. But I'm constantly modifying the production scripts (there is already a new one but not tested enough to be released) so watch out for the EA carriers.
The problem is to balance the AI in the start, middle and end games as the AI is using the same scripts all the time. With a few more ships of one type you will do great in later games but choke the AI in the beginning. It's much try and error, thought and testing, testing, testing.
[This message has been edited by [K126]Mephisto (edited 02 January 2001).]