Letting it bloom for longer than the instructions say
Very fresh coffee releases a lot of gas when the first water hits it, and for the first week after roasting the bed would still be bubbling when I started the main pour.
Waiting an extra fifteen seconds let it settle, and the rest of the brew ran more evenly. With older beans the difference vanished, so I only bother for the first week or so of a bag.
It is a small change, but it is one of the few I have kept without second thoughts.