Personally I don't. As someone who has a bit of an aversion against math in general this seems to be logic. Maybe this - besides the overall simplicity and consistency - is it why I find the approach here so attractive... But a fact is that one has to keep to its trades to make the whole thing work - and does not close his short without any real reason... Exits are really the hardest part for me. Therefore it was also interesting what you mentioned about the long entry at the bottom. I saw it, but I did not act in time, which costed a few ticks of the 9:46 short...