Hi there, I've been watching this sight for a couple of years and a fairly new member and this my first reply. My 2 stage had the same problem and a couple others. That plate will bend pretty easy, try a 12 or 15 inch cresent wrench, adjust to fit the thickness and push the upper corner inward. If it still doesn't look quite right pull the plate outward between the pulley and tractor the same way or with a large dead blow hammer. It might take a few back and forths. Essentially all your trying to do is get the small mounting surface of the pulley parallel and square with the drive line. Your idler tension and gearbox pulleys look real good in line with the set up, both of mine were really bad. Hope this helps Hydro.
Craig, central Michigan