Im having some major issues with my pour time. I have a diamond prestige machine that has an in built pour timer. Perfect shots on this machine run between 26-30 sec. I can be pulling perfect shots, perfect puck, perfect crema, perfect pour. Then my shots will swing, but not in a small way. Shot times can go as low as 10 sec or other times as high as 50 sec. This is not a gradual thing, 27sec then next shot 10sec. I then waste half a hopper on trying to get this grind to work (tapping group handle to dose more or less, tamping harder ect) or I end up dumping half a hopper and dialing the grinder in again. Effectively starting again. Not only does this cost me a lot of cash, the stress is about to reap havoc on my health. I dose the group head using a consistent method. I tamp consistently. My coffee is from a consistent brand(never had issues before).I have new filters, with good consistent water pressure. Blades in my Compak k10 have done 335kilo. We do have electric doors in our centre, but this has not been an issue in the past. I auto dose & manual dose depending on demand. I feel new to coffee but have spent the last 18 months building our cafe reputation for good coffee. We currently do aprox 35kilos a week. We live in country Vic, 3 hrs from Melb, on the coast & Im feeling like Im running out of options for help. >

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