Every few weeks a new sack arrives and the recipe we had settled into stops working. This month it was an Ethiopian Guji, washed, and noticeably lighter than the Karnataka lot it replaced.
What changed
We opened the grinder two clicks and dropped the brew ratio from 1:16 to 1:15.5. The cup came back with more body and the tea-like finish we were losing in the first few days.
If you drank the filter last week and it tasted thin, come back and try it now. Same bean, different hands.