You could remove the formation from the AI.
Go to the specific Race folder you are having trouble with, find the {racename}_AI_Fleet.txt file and look for a line that starts with:
Fleets Default Formation := Dark Wing
And change Dark Wing to something else - like Spider or Wall or Bull
You can also download this formation file and add it to your DATA folder, it has the Dark Wing formation (among others):
formations.txt
Enjoy!