That's like saying: "Never ever date Asian women", easier said than done
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Laissez Faire, I forgot to answer your question about the trailing P&L: once you're in the green for the week (month, whatever), you decide which portion of the profits you're willing to keep risking and at what point you will stop trading (same as with a trailing stop within a trade).
As with normal trailing stops, this has both advantages and disadvantages, of course.
Saw a misprint on SPX @1468 on my chart yesterday, which is beyond the 3-month inverse H&S target of 1430s. Is someone trying to tell us something again?