Ok, so basically your experiment showed that you got 2 deg C improvement, by actively turbulating the water over the coldplate.
Interesting indeed!
You're getting very low water temps, but there's a 12 to 18 deg diff between the water and the CPU, and that's an indication that there's a problem with your baseplate. I'd guess that it's too thin, but like you said, it was just an experiment, to test a theory.
Would you consider doing this again and reducing the gap between the impeler and baseplate even further, down from 1.5 mm? Alternatively, you could add brushed to the impeler arms.
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