Chances or requirements for getting the Red Brotherhood Hideout haven't been changed.
What's your Rumor Interval based on your choices in the character creation? Being 'a bard' at the 3rd stage, or choosing the 'left to fend for yourself' at the 2nd stage enables you to have the best (lowest) values, so that you can get more rumors in general. Becoming 'a self-employed merchant' at the 3rd stage enables you to have the 2nd best Rumor Interval value.
Other than these, you could just have bad luck, it happens. From my numerous playthroughs, I remember that two times, I got the rumor for the hideout the first time on day 300+. Despite that I had the best character background for this (see above), and that I always asked traveller NPC-s for rumors whenever I could.