This is coming from a total newcomer, please do chip in if you feel I'm wrong.
I know it seems counter intuitive but being a 901 user for a whole 36 hours

what works for me is dripping using a cart without filling so I can get a sense of how the juice is supposed to taste and how it begins to taste as the atty begins to run dry.
I was frustrated because sometimes everything would taste way too sweet (no idea why) or like burned newspapers (dry atty)
That's my two cents, hope it helps or at least provides fuel for further discussion.