So let me see if I understand 8-Ball correctly. Please pound me mercelessly if I'm incorrect
So, with the water moving too slowly, we get a barrier of water itself that keeps the heat from properly getting to and from the flowing water to transfer the heat out of the system at the radiator and into the system at the source (CPU).
If we move the water too fast there is a point at which we will begin to add more heat than we are removing with the added efficiency.
So the idea is to get that balance where we move the water just fast enough to break down that barrier of stagnant water with turbulance and cavitation, but not so fast that we are adding more heat with the need for a stronger pump that only contributes to the problem.
Is that the basics of what you were saying 8-Ball? I feel this thread has taken a toll on my grey matter...