Update: I coated the exposed wires of one of my thermistors in jbweld to make it waterproof.
My direct water temps are actually 2C higher than I had measured before. That makes the cpu-water gradient 21C (still too high) and water-air 9C (not great either, but my single fan is rheovolted to near silence).
I'm going to check the WW for flatness, and probably lap it.
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