Heh, the problem with them not guarding starbases effectively is that they don't research starbase defenses until turn 200+.

This is on 1.1b... and by turn 200, on a medium map, the AI is getting his a$$ handed to them by me, so it's already too late.
But yeah, I gotta hand it to them... they grabbed ALL the resources in my game except for one which was right next to my base. I thought I could afford to wait to grab it... nope. I had to buy a consructor before they snagged it on turn 7.
Make the AI tougher by having the research starbase techs early on (there's a mad dash for miniaturization tech... but starbase tech is way better). Hell, I destroy the AI with fleets of Tiny hull ships the entire game using a few quality starbases (sure I plug about 15 constructors into each one, but who's counting?

)
The AI either has to start using military starbases effectively, or seriously nerf them (they are by far the most powerful items in the game, next to morale resources).
Also, Armor Plating is a bit overpowered for my taste at Size: 15, Cost: 3, Defense: 1... shouldn't it be cost 30? My final "uber" ship configuration uses this armor, to bring my final cost per ship down to 60!