I agree that Special forces needs work, as they love to blob. I have sent almost 126 or so million resources of Fallen Spire Fleet ships (We talking all of the ships in extremely large numbers), against a Special forces army on one planet. There was 53 Carriers with 1000 ships each, and I was expecting my fleet to win as most of those would be rather weak ships.
Turns out 53,000 Guardians has little issues going thought that much firepower, more so when every single one of them is a MKV guardian. That was the game that had me posting a request to buff the Fallen Spire endgame army, as they could not get through that either.
I would love to see destroying SF guardposts to reduce the cap for the Special forces, and also for them to spread out (1 planet out of the 70 that the AI had at the time had every single ship in the SF.) I would also like to see them not fly around in Carriers so much. Or allow the Cookie Monster to attack Carriers. The AI should not just be able to not worry about it because every ship is in a Carrier like it does right now. I can allow some ships in them, but it seems like the AI realizes that Cookie monster is around and moves every single ship that Cookie monster could hurt into a Carrer and then just follows it around to be even more annoying.