Undervolting your fans means you're not getting great airflow. Undervolted fans lose a lot of torque so they can't push anything like as much air as a fully volted fan. It works, because HCs are massively overkill for watercooling not because they are highly efficient. A thinner design would likely give better results because of the fans commonly used in cooling.
FWIW I consider 38mm fans somewhat weak, a larger 50-60mm thick fan is a much better choice.
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