Personally, I don't see how coordination effects the max speed at all. I can see it effecting the acceleration or turning without a doubt, but not the max speed. Think about it, maneuvering does not lower the actual max speed of ships, it lowers how fast they reach that speed because everyone needs to turn at the same time or speed up at the same rate to avoid being separated and they need to reform the formation. The only case where the max speed would be reduced is if everyone was constantly flying back and forth from left to right of the fleet and the leader wants a perfect formation.
If you have five cars with similar max speeds going down a road with four intersections, they don't slow down when they all reach the exact same speed, they slow down when they have to turn corners and wait for others or when waiting for others to get up to speed. If they're all in formation and all can go at least 100mph, what's stopping them from going 100mph?