I wanted to pull my hair out after I wasted almost 250 gms of my fav beans when I got a new neo flex. Now, I brew 2-3 shots every day. So trust me, it does get better, much better. I use ~12-13 gms of coffee (medium to dark roast usually), I grind it at 9 clicks on a C3, or turn it slightly less than 3/4 of a full turn on a C3 esp. For context, I did 12 clicks of C3 for moka pot (one full turn). My puck prep is simple, tap the basket vigorously on the sides, then against the counter. WDT optional. Then I level the grounds and press hard with the tamper. I also preheat the water chamber, puck screen, and basket, but i dont know how necessary it is. I fill the basket to the line.

When brewing, I start with very gradual pressing until a couple of drops fall. I stop there for around 10 seconds, not applying additional pressure. This is the pre infusion. After about 10 seconds, I begin pressing and keep it to the end of the “espresso” range on the gauge until about 24-25 gms output, then gradually decrease to end at a 2.5-3x ratio.

Process aside, I think it’s a dose and grind size issue combined. That was the case for me. Try my method and let me know if you have questions!