I want to share my one of my optimizations here. I only used pairs with good profit potential in this one. I do have another set that does only very safe trades but doesnt trade very often.
There are two set files for EURCHF and USDCHF, one with lower risk and one with higher.
The higher one can go into drawdown but should be easily outweighted by the profits.
Personally i use both of them so i have an overall of 14 charts.
For ECN Broker i would recommend a max spread 25 – 30.