Hi Graham, I don't know about 'master', but one tries! One of the plus points of my sad little existance is having plenty of tying time to fool around with such 'wee changes'. Remember though... for every aesthetically pleasing, or productive tweak you see on here... there's a dozen that get consigned to the recycle bin!
It's easy to get carried away with tweaks and variations on a theme, and I'm as guilty as the next man for churning out countless, pointless variants. What I
try to do these days though is to only make changes for a reason. If you truly believe in your reasoning and your changes are based on some kind of logic, then you'll truly believe in your pattern.... and catch lots of fish!