This mod is a total overhaul of the AI. It covers a wider range of difficulties than vanilla, all of which play in a more humanlike fashion than their vanilla counterparts.
Download the Queller AI for Planetary Annihilation - Exodusesports.com
The Queller AI (yellow) fights the default AI (white). This isn't a perfect comparison because there's an AI file called ai_config which differs between the two AIs but has to be shared. In this instance the default copy was used. Queller has a much lower dependency on the ai_config file in naval battles so I only did this one test. Queller might use more air fabbers under its own config. I gave Queller the north island since in my experience that's the one the AI performs worse on. Due to the fact that Queller is far less reliant on the ai_config file for naval battles I only ran a game using the default ai_config.
This is a slightly modified version of Queller 1.2.4, so there may be some odd behaviour from changes which haven't yet been fully tested.