I've been using a bottomless portafilter in my cafe for about a year now. There is one thing I can't seem to figure out. The stream of the coffee more often than not is tilted to one side of the portafilter. It tends to lean towards the back. We've checked the machine and it's level, we've been very careful about our tamp being level for uniformity of extraction, and still haven't been able to figure it out. It tastes great, so I've haven't been too worried, but still think it's a little odd. Any suggestions?
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