Well, when setting up all your players in Advanced positions with attacking duties, you have to make sure that their teammates gets the ball forward quickly. If your supporting players dwells on the ball or try to play à patient and possession based approach, then the movement Of your front 4 Will have been in vain, resulting in that when the ball finally arrives in the final third your attacking players are standing still, again being marked and the opponents being in good defensive positions.
So, highish tempo, lots Of Width and à more direct game.