Find your fighting style with your fleet. i use group of 4 and groups of 2.
A nice silo formation always comes with a way to use em. there are formations that are used for a more defense gameplay or more offense gameplay. Every player has his SUPERGUN (silo formation) and his theory. (don't place silos in a manner where you don't know how to make a perfect silo launch).
I agree with rus|mike .