Auxiliary Transmission Cooler Placement

That shroud appears to be more of a guard. Not doing anything to guide air flow. A good fitting shroud will help. I would move the trans cooler to the front and space it out from the radiator. Try bypassing it to see if you can get rid of it and rely on the one in the radiator. It seems like that aux is going to impede the airflow through about 50% of your radiator.