So here's what my idea was. I am going to tell you, because someone might be interested.
Roughly speaking, a good and consistent system I found is to simply get an average and buy against it (if you're below the average go LONG and viceversa), for example on the EUR. It works year after year, on most markets. It's the principle of the zig-zag. Markets don't go somewhere straight but by zigzagging, wherever they go.
Now. This works great on overnight (with great drawdown), daily trades I mean. The problem is that I want to make it work at an intraday level.
It works even better and reduces the drawdown, and that's the advantage. The problem with the intraday is that while it consistently makes 55% of wins, all profits are spent in commissions and especially in spread (of 1 tick on the EUR).
If I could find out a method to filter some of the bad trades out, I would get closer to what Heypa recommends - only make trades that are profitable.
I think my next step will be to look for a method to identify phases of range (multi-day range), which might help this system.