It's a shame you're only using 1/3rd of the IC's surface area! It makes the other 2/3 redundant.

You should at least trim the shroud/duct back away at least 2-3" from the core to allow air to pass over the entire core and not just the center 1/3 of it. You're no realising the full benefit of your big-azz IC with the way you have it shrouded right now.