Q, I have d/l your savegame too and took a peek at what is going there.
So far I have taken control of Sergetti to see how are they doing, and I must admit that I am kindda proud of them
. However, it took them forever to finish their movement (about 30 minutes at least), so I didn't get any further than that. I can make an assumption on why they don't show problems with building queues like the rest of the races. Assuming that Mephisto is right and AI mostly uses Defensive state, the important change is the Last line in the Sergetti_AI_Construction_Vehicles.txt file that makes them build large number of attack ships (the Last line in the Sergetti defensive state queue, of course). You could try putting these lines at the end of all AI states for all AI empires and see if that helps. I just can't find enough time to test this myself.