Thanks for starting this thread davidzo.
Could you get more specific about some things. If I am interpreting correctly the sensors are DS18S20 ONEWIRE digital sensor at 9bits. This is not at all high resolution although I am not suggesting it is inappropriate for the purpose. Can it be upgraded to something more accurate. (I am not confusing resolution and accuracy BTW, one limits the other.)
The FET heater, I like the idea. How is it controlled? What is the feedback if any. If none why not, how do you maintain a constant power output.
Flow control and measurement. DFK, is that a make of flow sensor, how does it work? Flow restriction etc.
Any pressure measurement possibilities?
Is the fanbus regulate-able by water temperature via the software or is it just the 5V,7V,12V steps.
Is there a die simulator attached to the Heater?. Size, material, sensor location relative to die surface. Waterblock mounting system?
How is the whole calibrated? Is there a procedure? I think this would be necessary if results from this are to be comparable between systems.
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It should make the testing easier and better because the precision comes also with the number of tests you do. The more testloups with remounting the block you make, the more accurate the final results are (guaranteed that the equipment is good).
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I do agree with the first part of this statement. The second part I am not so sure, an improvement in a given mount suggests that the previous mount's data is not accurate. Still, thats a generic problem.