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Rich, my understanding (though limited) is slightly different on the flow control for brushing.

My understanding is that the flow level works exactly mathematically like the opacity level except that each step occurs with each successive daub that the paint brush sets down within a single stroke.

The maximum value that can be achieved with the flow control in a single stroke is the limit set by the opacity control. Subsequent strokes work similarly i.e. geometrically and not additive  (10 daubs at 10% won't add up to 100% through it is close on the first few daubs)

Another tidbit is that the flow opacity and flow control are multiply with each other.   The first daub put down with opacity at 50% and flow control at 50% is 25%.

So I think in terms of the flow control (multiplied by the opacity control) sets the increment percent that the brush can change the color with each daub within a single stroke and the max within a stroke is limited by the opacity control level).

To go higher is simply done by doing additional strokes with the steps again being geometric starting with a new base value from the previous stroke.

The math if more academic because it all becomes natural through experience with use as with any other skill.  It just may help as a starting point with what to expect.

That is at least my understanding

John Wheeler