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I made that whole post about W$WSF awhile ago... but if you're winning - you are doing something right.

W$WSF is a good tool to look at if you're losing as one of the many possible leaks. If it's low and you're losing - you could use it to correlate with the amount your calling oop. It could be lower because you're calling too much oop or too much in position with speculative hands and not playing them properly.