My backtest shows that if the trades are bad, u will be stopped out early without losing much. If the trade is good (lots of long bars) you will be stopped out when the trend(趋势) is first exhausted(排出).
Worked for me, hope it worked for you.
P.S, just pick a direction and try it...I know it sounds silly (funny to me too) but this is just my observation(观察). Hope you can double check it with me and report your findings.