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Ooh... that is really interesting! I knew it was probably going to be something weird!!! Lots here to think about... Flow is another one that fascinates me: I was able to paint a single stroke at (apparently) 100% whilst having flow set at 25%. Brush spacing has interesting influences on flow. But armed with this technical info, I shall go do my research. First stop though is google for 'Gaussian curve' and 'sigma'. Those terms are new to me. I always wondered how Gaussian blur got its name. Thanks for both for these really helpful answers.

Where I'd like to get to with all this, is be able to determine exactly the blur settings for any given image based on it's pixel size (and flow/opacity based on what I want) without the trial and error element. That said however, experience by itself is largely overcoming this; but all the same, I'm a closet scientist - I like to know how things work