In the end game, I tend to have 20 Hoshikos per fleet, and just let them do what they want.
I also include 5 to 10 Cielos, just for focussing the fleets a bit.
The downside of Hoshikos, is that when you move a fleet around, they tend to lag behind, as they have a habit of wanting to fix anything they come accross on the way. So they are always the last to jump in at the destination and sometimes well and truely late. They also tend to be a bit vulnerable in mid game, especially if you dont have them in numbers.
Cielos are pretty useless combat wise, but as such, very rarely seem to be targetted. But having a few in the fleet does seem to make the fleet much more effective. Again, I tend to only use them in end game fleets, especially when the oposing fleets are very big.
