About that Aquacoil... I'd bet it would perform better if the fan wasn't mounted right up against it, because of the center dead spot of fans.
If there is any way... you could try building a shroud to lift the fan about 2 inches away from the Aquacoil. That should be about optimal.
Also, if you've got the time and the tools, you could re-arrange the coil so that the coolant flows through it in parallel, not in series: it would perform better as the coolant flows slowly, and would be less restrictive, which would make the WB perform better.
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