The trick is whenever you do such contra trades or bottom fishing (or top hunting), do it only with 1/3 of your trading unit size, and never fall in love with the position, never increase it, just consider it as it is, simply a contra trade!
Would you like to have one more confession? I gave back most of the money to the Market (read I lost :-) ) this year on USD long attempts so far! The key is always position sizing, not winners/losers ratio! But still.... on USD I have not been correct