The following two strings demonstrate the avalanche effect - you got a range, very huge yeh, but it's a range anyway, so yuor effect got a start and got an and.
he show 2 pref with WVs, nice if you ask math you got something like that 2^65 / 58^10 ~ 85 - 13zb1hQbWVs

so where is here you avalanche effect could be?