I just got a new IMS 18g nanotech precision basket for my Gaggia Classic but have had lots of leaking around the portafilter. Inital thoughts were to replace the gasket, but this leak only happens when the portafilter has coffee in it. With an empty or blind basket, there is no leak occuring.
I've tried reducing the dose down to 17g from 18g which helped the amount of water coming through but still getting a bit of water leaking out. I've also made sure that no grounds were caught in the seal. The puck at the end looks quite wet and soggy as well.
What could be the problem? Am i stil