You're not doing anything wrong, any backtest with a martigrid system will probably fail in the longterm. This kind of systems are supposed to be constantly monitored, and used in safe hours. London/USA sessions, tend to trend and that's not good to this kind of EA.
If you check carefully you will note that this kind of EA's fails always on the same days, when there's movements of about 150-300 pips, with no retracement, in the same direction.
So, you have to try to avoid trading before news events, fridays or events like brexit.
This EA have a good and constant result when the pairs movement is ranging. If you "eliminate" those nasty volatile days yours backstests would have better results with no account blown.
Trade safe.
If you check carefully you will note that this kind of EA's fails always on the same days, when there's movements of about 150-300 pips, with no retracement, in the same direction.
So, you have to try to avoid trading before news events, fridays or events like brexit.
This EA have a good and constant result when the pairs movement is ranging. If you "eliminate" those nasty volatile days yours backstests would have better results with no account blown.
Trade safe.