What I meant to point out, was that because both the 7/16" and 1/2" ID tubing is using the same ID sized connector, that the results may be skewed.
From what I remember back when I took aircraft hydraulics (over a decade ago, so yes, I could be wrong...), when fluid travels from a large diamter tube, to a smaller diameter, the pressure increase, but the volume of fluid decreases. Likewise, going from a smaller diameter tubing to a large one, would decrease the pressure, but increase the volume of fluid. Isnt the volume of fluid the same as what most refer to as "flow rate"?
If so, then going from a smaller diameter tube (7/16") to a larger (the 10.5mm barb) would result in more flow. Going from a larger diameter tube (the 1/2") to a smaller (the 10.5mm barb) would result in less flow, or one can say, a restricted flow.
If you look, there are (relatively speaking) large differences on the flow rate chart between the two 8mm and 9.6mm ID tubing, when using a smaller ID barb, to the quick fit. I'm guessing the quick fit ID matches that of the tubing.