Careful; you are reading a lot into a graph that has low resolution and perhaps isn't the best anyway. The thing I would really feel comfortable with saying for most of the blocks we use is that if your flow rate is below 1GPM (which it probably is using 3/8" tubing) then there is a fair amount of performance that you can gain by switching to 1/2" fittings. You could also probably get nearly the same effect by just drilling out your existing 3/8" barbs as much as you can.
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