I can't understand your method, why are you looking for base58 addresses, can you at least explain this non existing mathematical relation? Base58 addresses distribution  can not be determined by permutation equation.
You know what you should do? You have to explain a mathematical logic behind your method which should be reproducible and   verifiable by everyone else.
Nobody knows, maybe hash 0 famous address with all 0 characters is somewhere in 66 or 67 bit range, right?  When there is no possible way  to accurately determine that, why do you keep doing it over and over and expect a different result?