Doing it this fall will gain you very minimally, as the roots probably aren't going to grow much after that point. Also doing a repot now means overwintering at temps between 35 to 39 degrees optimally, as you don't want it to freeze this winter, and 60 inside is too high so you will need special conditions.
The dormant "autumn" I believe is actually the dead heat of summer, so you will need to make a decision soon. You don't have your zone up, but if you are less than zone 6 I would say wait till spring.
My other thought is you have seen it done is a little different than , I have done it. If you are comfortable with after care it's ok , if not wait.