By analysing past trades I found out that the main detriment to my performance is "large-loss" days I have every few weeks. Typically, I aim come out with profit or flat on the day. However, Through occasional lapse in discipline I may allow more than a couple or loosing trades in a row and these are difficult to recover from. What I found out is on most "winning" days I run only a small loss. So, I want to set a smaller daily maximum loss. If I ever hit it, I will assume things aren't working for me and stop trading for the day. Do you use a firm daily stop-loss in your trading? If yes, how does it compare to average daily profit?