title_body: Espresso - Dose affecting extraction time disproportionately
upvoted_answer: I would not exceed 20 grams on a twenty gram basket. Weird things start to happen. 
  
  I would make your grind finer - and simply stop your shot quicker. If it tastes overextracted, then stop your shot even quicker the next time. Adjust accordingly until you get the sweetest shot you possibly can. 
  
  Your general espresso recipe for a well roasted coffee should be somewhere around:
  
  20 grams of coffee in
  extracted for 26 seconds
  A yield of around 30 grams of espresso
  
  I hope this helps and good luck!