@yalgaar - the candle size won't tell you that... you may be better off using the close of candle 1 divided by close of candle 2, which is how much price changed on the last trading day (in relative terms), which then MAY be used to say whether the pair is strong or not.
Yes, something doesn't work and I will check it. But you can better do it that way in this case:
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In "Buy now" and "Sell now" you also have few Money Management methods. Basically this is the way to decide the next lot size based on the lot sizes and the profits of the previous trade/s. One of the methods is "Betting: Custom sequence" where you can select what lot sizes to use when the previous trades were losses or profits. I don't know whether this helps, but you can try it 🙂 Also the Martingale itself is customizable.