I think they key is going to be more airflow. As you said you are seeing a decent delta temperature across the duct (which I am a bit surprised by). So, while additional surface area on the barrels would defintely help, more airflow is going to help more at this point. I also like the idea of Piwoslaw's baffels. One on each side (not like shown) should get you airflow around 90% of the barrel vs only around about half as you currently have them.
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