Can't tell from the pics, but the fan should be 2/3 into the shroud for maximum air flow. IOW the pitch of the blade should be 1/3 of its length outside the shroud.
It should help - it is the suingle biggest improvemment in airflow you can make.
Nice but trim it up a bit so the blades stick outside of it alittle when viewed from the side. Also something like this helps keep hot engine bay air from being sucked in from the sides of the radiator.
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