Man , my record was 36 without epic with about 17% chance
. But also I crafted 5 epic from 6 attempts
. So it is random .. I think it is OK. I have statistic for 4 accounts for over 500 crafts each and in such large quantity of crafts - numbers are rather similar to given numbers. Although true is on all accounts are little bit smaller for epic, but larger for legendary. Anyway I think "numbers" are correct.
Jan