Ah, scratch that - It's not the most elegant solution, but I did the following:

- instead of generating the graph with percentages, I used plotMAEGraph(50); instead, so I could see the actual pip values
- I then set a basic stop at the 120 pip level as that represented the vertical line that Andrew alluded to
- this improved all metrics in the test period

One thing that you can see in the newly generated output, is that even with a stop at 120 pips, there is a number (albeit just a few) losing trades that have a value further right that this level. Which seems strange.