My thoughts at first glance:
I can't quite see, but are those 90 degree elbows on that bayres? It doesn't look like they're needed, and they hurt flow lots.
Radiators need shrouds. Remember, it all boils down to aircooling.
Is there another fan on the other side of the radiator?
Have you considered upgrading to a heatercore? They're cheap to experiment with (~$20 US) and should outperform that blackice in terms of dissipation.
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