Well, I don't know if I can call it a routine, I try to transplant them to small pots as soon as I can 
I like to do this as soon as possible, when the roots are very small, it's easier to separate each plant.
You are not the only one who burn seedlings : this year (like previous years) I gave them too much sun light too soon and some of them are toasted, so I replace them when needed.
It takes time... so I do it as soon as I can (or I should say : when I find time).
If I had less strains per years, I would probably try so start the seeds directly in the small individual pots, but with 4 or more strains on each board, I am sure I would mix everything when dropping seeds...
I like to do this as soon as possible, when the roots are very small, it's easier to separate each plant.
You are not the only one who burn seedlings : this year (like previous years) I gave them too much sun light too soon and some of them are toasted, so I replace them when needed.
It takes time... so I do it as soon as I can (or I should say : when I find time).
If I had less strains per years, I would probably try so start the seeds directly in the small individual pots, but with 4 or more strains on each board, I am sure I would mix everything when dropping seeds...