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



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 dukascopy, but those comes as .csv files and it looks like in MT4 folder all are hst. Im not even sure if thats the real way to do this.

I just need those 99% on a backtrsting, that must be possible.

All the best