Fireblade8

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Backtesting quality om MT4 now n/a and sometimes around 50% - I need 99% quality, how?

Hello, my first post here :) Im working on a robot for US500, but the backtesting quality with every tick is mostly n/a so I can not trust. The open trade is around 50% which is also way to unsecure. I need a 99% quality when I make a backtesting on MT4. I have tried to download 3 years history from