Hello wienky,
what game version are you playing ? FAF ? Steam ?
Did you use the latest Total Mayhem version 1.37 ?

In case you are using FAF and Total Mayhem version 1.37 then please try my AI.
Its 100% working with Total Mayhem
https://forum.faforever.com/topic/350/ai-uveso-v88-ai-mod-for-faforever

And please post a game.log in case it does not work.