I decided after a short break to start up AI war again. The game in question was one with CPA waves active. Noticed that the waves would refuse to attack several of my worlds. They would just sit at threat until several more waves piled up and they would overwhelm any logical defenses I would have installed on the world. I was unable to find a effective way of clearing out these giant threat pileups.
Made a choice of ending the game and turning CPA off for a more normal game thinking it a fluke. Game went along normally until I got my whipping boy up. Again the AI refused to advance until their numbers were extremely in their favor. I used a world past the whipping boy to add a ingress point allowing them to not warp right into whipping boy. Insult to injury at times a wave, which had jumped right into the whipping boy, would just abandon its attack and retreat en mass.
Eventually these waves would clog around worlds I had defended with no way for me to move them short of warheads. At first I used riot and other tractor craft to pull chunks of the wave into my worlds but their numbers got so high, they just instantly killed anything I sent out to fight them. Have just a light turret layer on the home world right now and a wave of 2.2k ships just sitting outside of it.
I rather dislike this new flow. I used to imagine the AI being bloodthirsty with these ships as it always had more to throw at you and break you. Now they seem skittish and fearful for their lives. Saw that there was a change to make turret firepower no longer be considered 1/10. Think I might need to figure out new defenses measures.

Anyone else have any thought or advice on this?