Thanks again, Andrew.

I'm probably doing something wrong but it seems to only make things worse when I try and add this type of trade management into the mix.

I added your code to create the var, then the below:

Code:
for(open_trades)
   if(vPercentMAE > 1.0)
   exitTrade(ThisTrade);


Even optimising this parameter does not help.

In any case, this is certainly very good to know and I will certainly use this (i.e. the MAE graph) in future development.