Question for any pros

[Molina]

To any of you that earn a living purely from poker, or anyone who has a professional attitude to their poker.

I assume you have a bankroll that is either X buyins or X dollars/pounds/whatever. How do you determine when you will withdraw surplus from the BR? Personally I withdraw my winnings in £50 chunks over my bankroll, though I do find it slightly stressful and groundhog day-like to always be starting the day at zero or minus if the BR swung down a bit after cashing profit out. Obviously though siphoning cash off is what we live on.

Plus, does anyone keep a certain % in order to make the bankroll ever larger, if so, at what point do you decide its time to bump the BR up however many units?

Appreciate any comments, bankroll chat is mainly 'you should have 300 BB's' or 'you should have at least X buyins' and so little is mentioned of peoples approach to living of their bankroll.