Ive said it before but Izquierdo is supposedly able to play anywhere across the front line, so play him in the middle, at least give it a go, id back him to win anything over the top of the defence and he certainly isnt afraid to shoot.
As for Propper, hes playing in the correct position as far as im aware, its Stephens who has been a bit of a problem from what ive seen, cant tackle without fouling and his passing has been woeful. Hoping hes just been out of form, he was much better on Saturday although did still give away a free kick on the edge of the box.