People say you should aim for 10x turnover but that is in part due to certain brands of filters only really supplying 50% of stated flow.
Regardless of what brand, actual flow rate, or expected flow rate, the 10x "rule" still comes into play.
It's up to individuals to test what their own flow rate is, after taking into account head height, how much media etc etc. I know not many people will actually do it, but it's pretty easy to put a jug under the outlet and time how long it takes to reach a litre, as you probably know from your tests. I'm guessing a lot of people will be shocked as well
I'm pretty sure though, that someone didn't come to the conclusion that 5x was the optimum flow and then said, just double it because companies lie by 50% how much is actually being turned over
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