Hi,
That's great that you are seeing positive results!
On the radiator inlet/outlet discussion -- I thought that most radiators feed the hot fluid in at the bottom of the radiator? I'm not sure that this matters really -- the heat is extracted from the coolant and transferred to the air *somewhere* in the radiator. From what I know about cooling, it is far more important to have good, efficient air flow; and the lower opening (near or below the stagnant point) is the best one both for the cooling and certainly for the air flow on the outside of the car.
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