Tech's right, and I didn't notice the way they mounted that fan adapter plate. Having it flat against the core totally blocks off the core area not open at the two circles, almost guaranteeing cooling problems if you're pushing the heat limits.To be an effective shroud that plate needs to set back, off of the core by at least 3/4" and an inch wouldn't hurt - a big sheet cake pan with two circles cut out so that the fans pull through the entire core area.

I'd send that radiator back to Entropy, unless you want to re-work it and void any warranty you may have received. Having the "shroud" like that makes me wonder what ELSE they don't understand about the design needs.