Yes it was a very well thought out article. I think that the take home message (for me) was that you can probably be doing more with the smaller pump you already have. Moving to a true 1/2" system (where the fittings are 5/8"OD and 1/2" ID) where possible and removing elbows to try and limit the pressure drops everywhere except the block will let you often get by with a smaller pump and still have optimum performance. Not sure what 11x6 radiator was used though; I wouldn't expect that large a difference if they were both similar heatercores.
Comments about head are good; People who went to larger Danner pumps in hopes of higher flow rates often were disappointed by temperatures. That was because the larger Danners still don't have that much PSI production and so all you are basically doing is forcing an even larger pump to produce more heat and dump it into the sstem (pumps generate more heat when throttled back with either a ball valve or with a lot of 3/8" barbs).
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