Ok so I know all of the obvious ways to attmept this. Such as setting the AI to aggressive and in the case of your AI allies, selecting their fleet and asking them to attack. But these two ways have left me very frustrated.

I just downloaded the Distant Stars mod and find it to be amazing (great work guys), I'm currently playing a 5v5 on the map called "into the breach", which is an excellent map. I love that it condenses all of the action to two or three grave wells, or rather it should. After about 40 min my team controls the center dead asteroid quite firmly and I have built and fully upgraded a star base plus a full compliment of tactical buildings, but now there is a problem. Now all of the AI teams are set to aggressive and cruel difficulty, and yet the entire enemy fleet just sits in in the grav well of their first planet and NEVER attacks, EVER. Likewise my 4 AI allies have a huge fleet all clustered in the dead asteroid grav well around my star base, and other than one of them attacking once, they also NEVER attack. I have 15.00 or so diplomatic relations with them and have selected all of their fleets and told them to attack, while also spear heading the attack myself, and yet they SIT there. This has completely ruined the game because all that is happening is there are a ton of scouts going all over, but no real combat. Is there any solution to this sort of behaviour? Anything I can do to make them attack or little quirks to look out for that make the AI at in a very passive manner?