One more question please
Do you protect EVERY area that you colonize? Do you spend the currency to protect asteroids or just allow the pirates to kill them occasionally? Because it take a lot of currency and time to fully protect a colonized area.
It seems like my enemy always has one large army roaming all over the place which gives me the impression that he (the computer) does not heavily protect EVERY area and simply allows some areas to be conquered, then re-colonized.