Ok I still am playing around with the data a bit but there was an anomoly that stood out:
There seems to be a flow rate range that results in coolant temperatures substantially lower than one would expect. No big deal; sweet spots are not unheard of after all. But WHY would the delta T between CPU and coolant change too? It seems like it should stay constant (as it does in the other flow rates). I am struck by the possibility that this might be related to the increased C/W at low coolant temps seen in previous data. Any ideas WHY this would happen? I can only speculate that something in the wb's performance or something in the CPU heat production (???) may be the cause the increased delta T. Puzzling.