First: is your flow rate from your filtration consistent? Have you changed your filters lately? What does the gauge read on the filtration for output pressure? Are you receiving 1.5-2 GPM? or 40-60psi?
Lets make sure the pump is set properly. Insert blind portafilter, turn on to full brew. Does the gauge read 10 bar? If not adjust the pump to read 10 bar.
Next can you perform a flow rate on the full brew for me? See if there any inconsistencies. Tools: Timer, gram scale, water catch. Run a 10 second full brew flow rate test. Please run three tests in a row and provide average. Please test each group.
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