Either youre distribution and tamp is bad causing channelling or whatever dosing method youre using is bad.
If youre using an automatic dosing method you really need a decent amount of beans in the hopper. Automatic dosing methods should only be used in a retail environment where time is a real issue. At home its better in every way to do things manually. Grab yourself a cheap .1 gram scale from ebay. They can go for around $5. Start weighing every shot.
@summercrema; the smart grinder is only accurate to about +/-1 gram even with a full bean hopper. This isnt really good enough for espresso. However its nice to have it grind out a rough amount for you. Then you weigh it and adjust the dose accordingly.

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