Not everyone changes formations regular to counter there opponent me included, I always start with the same formation except when I see a high quality team with many players in the attacking half!, in this case I play 4 defenders in stead of 3. I use 3w-1-4-2 and accasionaly 4-1-3w-2, now if during a match my opponent is over running me or is wiining I will alter my formation then and only then!, usually to 3w-4-3 or 4-3-3!, switch my orders to hard attacking and force counter attacks!, this has worked very well for me over the last 3-4 seasons!, it also means my opponent can not change his formation untill during the game either so unless he is watching the game I gain an advantage.