Wmf bistro and all other similar coffee machines work on grinder resistance principle. So try tightening up your grinder for start...
You should have your shots pour around 15-20 seconds
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There is a fully automatic coffee machine called Eversys, they are not cheap but they are making coffee like no other coffee machine.
If you set it properly up with good coffee and good milk by professional barista and good technician you will be on your way to success.
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