Diversifying your forex trading strategies is the best way to handle the ever changing and volatile market. One of the good EA is the Dynamic Scalper Pro. The backtest results were great and looks good. However, you need to give your email address and once you have done it, they will send you a lot of spammed emails to you, which is kind of irritating. I would this suggest to n decompile and remove the email authentication.
Should you want to use this scalper, you may download it by optimizing several pairs during the previous week. Seeing the backtest, it looks good. You may try it on forward run as it made some good results. One more point, never to forget to switch Auto_GMT to true.
The backtest was slow. Stopped on BT on EURGBT and the results were not that good. But as for EUR/CHF BT looks ok. If you will use GBPUSD, make sure you use the correct GMT to make good results but not at all times. Also, it seems that the EA checks for purposes of showing it off only. There is no effect in actual trading. It contains a lot of bugs, therefore it is not advisable to use it in live accounts.