However, I've noticed that they've become pretty savvy tacticians, using their cheap fleets with remarkable ability. It's entirely possible that they're just competently running a hit-and-run style of warfare and catching you off guard because you aren't watching your back.
Actually, with the Korath, with what I'm doing now, I have no way to combat this - (the Torians) they're FAR too efficient. I can't pay the upkeep on a navy decent enough to defend and attack at the same time.
Funny thing, the Terrans declared war on me earlier by way of a random event; and, by way of a treaty, the Iconians followed - even though my military was literally calculated to be ten times stronger than the rest.
Funny thing, they actually started kicking my butt real good. The relentless AI keep coming with vastly inferior ships, slowly but surely ruining my extra-planetary infrastructure and taking a few planets along the way - I tried moving a few of my capital ships out to intercept them before they got more economic starbases.
I could not keep my economy in the green and pull off prudent offensive maneuvers at the same time so I tried to negotiate peace. Amazingly, they were begging for peace! They would sign the agreement, no strings attached. Hmm. I found, in exchange for peace, I could bring in over 10,000 bc from each of them and a planet apiece. I hadn't seen this kind of cash since I played the Iconians and gathered up half the galaxy! - an easy thing to do with their tolerance to harsh conditions!
I just gave away the entire navy to the Terrans and they're the new "Dread Lords", cruising around the galaxy, with almost no economic hit whatsoever.