That's interesting because it would probably pay to keep those...

That's interesting because it would probably pay to keep those trades up your sleeve in case a big move started, you wouldn't want to miss it.
Also luck would come into as well because who knows what the market could do to your trades, even one that seemed perfect at the beginning of the month can turn ugly.

What about a stop loss, 85 pips and that trades history ?

The winner may just be the trader that's still alive for the longest if its a bad month.