[tewall]

Matt Matros commented about this in his book on the making of a poker player. He went through his hand histories very carefully, and found a number of leaks. Basically he found he had been accumulating certain mistakes (such as playing too many hands, not sufficient values OOP) too slowly to notice while they were happening, but he was able to discover them when looking through the hand histories.

You could get someone else to look through them as well.

But your downswing is a very short amount of time. His dry run was much, much longer than yours.