If you are lucky enough to be on the winning side. However I have found that building relatively useless ships (vs their powerful ships i.e. a Battlecruiser against a Dreadnought) on my lower production planets is a good tactic to ward off any major advance for my opponents. I take one excellent PQ planet and build a Manufact. Capital and Hypion Manufact Center there so that my production increases two-fold. That particular planet produces my best ships quickly and efficently.
I have also taking a shining to taking out the more effective minor races, i.e. the Alexians, who seem to always have excellent manufacturing district. They normally have decent planets with a good manufacturing output allowing my production to soar.
Lately I've been having troubles with the increase in AI intelligent. So I've been more on the defense rather than on the offense like I want to be. So slowing down enemies is a good way to last long enough to mount a successful counterattack.
-DA
On another note: The EVIL EMPIRE is looking for good recruits. You fit the profile nicely, sir elmo3. It would be a pleasure (or is that hateful?) either way we would like to have you join us. But thats up to you LOL