So I take it you don't push the fluid through your radiators then? You actually isolate the flow to res > pump > block > flow meter > res? If that's the case then there is your answer for the difference. The rest of his setup must be providing the added restriction then.
Either way, this is why I like and dislike these reviews. Realistically they are good to get an idea of the expected performance but the variability of each of our setups can always result in different practical results. I am absolutely not saying that I do not see the values in these reviews, just that they are always contentious.
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