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In my uneducated opinion that’s a coffee issue. I get that with certain roasts and not others with all other factors being equal
mrJL-
My uneducated opinion too, but I get it with every coffee and basket I've tried. I've always put it down to tending to have a little more headspace. In which case you might find certain coffees do it because they are more dense so they leave more headroom. I remember trying darker low elevation beans once which barely fit in the basket. True story.
Apparently a little variation in headroom has no impact so I don't worry about it.
neu
Delighted to report the IMS Precision basket and the WDT have made a massive difference. I had a tiny bit of channelling the first shot I pulled through, so made the grind a little finer and the second shot was spot on. It'll need fine-tuning, but it's a vast improvement.
A big difference was the depth of the basket. Old one only left a tiny bit of headroom with 18g coffee in it, whereas there's at least 5mm in the IMS. Also means I can line up the top of the tamper with the brim of the basket to make sure it's level.
Only issue is I'm getting a fair amount of water retained on top of the puck after the shot's been pulled. It hasn't affected the flavour, but pretty sure that's not meant to happen. Any pointers as to why it's happening and what I can do to prevent it in future?