title_body: Dialling in with a Barista express
upvoted_answer: I have a Sage with a built-in grinder as well. The grinder isn't great, it has some inconsistency that may clog part of your filter basket just enough to reduce the flow a bit more than you'll like. 
  
  I've solved this by adding a wet paper filter before adding the coffee. For this I use paper filters meant for AeroPress, which are only slightly too big for my portafilter (like 2 millimeters too large in diameter). My technique is as follows:
  
  
  Push some water through the filter basket to warm it up a bit, then dry with a paper towel.
  Add a pre-wetted paperfilter to the bottom of the portafilter, press it down with your fingers. It's okay if the sides of the paper filter go up a little bit against the wall of the portafilter.
  Add your ground coffee as you normally do and tamp. Then pull the shot.
  
  
  For me, this allows me to push a bit more water through compared to keeping everything the same without the paper filter. My theory is that it keeps the holes in the filter basket nice and clear so the water gets pushed through more easily. 
  
  Seeing that this is a pretty cheap option, I'd give it a shot.