No, no, no, no, no!
Increasing flow does not increase heat dissipation! It can't. At equilibrium, the rad always dissipates the same amount of heat - the amount added by the CPU.
What increased flow does is lower the delta-T between the coolant and the rad required for the heat flow. This decreases the overall coolant temp. It does not increase dissipation.
At equilibrium, the coolant temperature will drop by exactly the same amount in the rad as it increases in the block. Else we wouldn't be at equilibrium.
The best way to get the coolant temperature as close to ambient as possible is to increase dissipation to the air - either by increasing the fin area or moving more air. Sadly (since it adds to noise) this is the area most likely to show improvement in a WC setup, and the one most often ignored.
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