humm i always change my formation to what team i am and what players i buy, i tend to go 4-4-2 with the wingers attacking.
if i am playing away i some times change to a 4-1-2-2-1 with 2 wide wingers
if i am playing away against a tough team or a team with creative players i tell the CM not to make forward runs and mark a specific player tight :)
hope i helped :) | 
