dearmad-
you know, for someone with the 'diplomat' title on this forum, you are pretty damn patronizing. I have a feeling that maybe you are a little too full of yourself. -chuckle-
I play tiny maps specifically for short games, not to take advantage of the AI.
The problem I am seeing in GalCiv is the exact same problem I've seen in every 4X game I played since Civ1 that allowed you to trade techs.
The AI is essentially being given a trade advantage to compensate for the fact that the human player can spam his new techs simultaneously to all the AI players, thus reaping great dividends for his research while simultaneously preventing the AI from doing the same thing.
It's a tactic that some players think makes them strategy "experts" for figuring out, but in actuality it is just a cheesy exploit that I am surprised has not been fixed in the 10+ years since Civ1.
A simple fix would be to limit the number of diplomatic exchanges you can have each turn, ideally to 1. Then you would have to anguish over which AI you want to deal with. Of course, this limitation would apply to the AI as well. However, this cheesy is very tasty to a lot of players, so I'm guessing there would be too much resistance to it.