To change the formation without changing players comes basically down to wether Diego can play not as a AMC but as a winger or a second striker.
Diego looks better with creative/time changing players, not better, just not alone. I would like to see him exchange passes with Gio. Momo and Melo must play in my humble opinion.
Right now, Amauri and Trez might just be the same thing because they never get much contact with the ball, they only appear for headers and holding-up at the mid-field.