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It shouldn’t be. Have a little play with the screw that attaches it to the shower plate? It can be a bit finicky if tightened too closed. That looks quite coarse for that tight on the nice - have you tried recalibrating? I know they can reportedly wander a bit.
@JB have been moving house so haven’t had a chance to play as much as I’d have liked - still feels like more machine than I’ll ever get my head round, but guess that’s a good thing really!
Have some annual leave coming up where I’ll have a bit more leeway to experiment when I can face being wired all day from more than a few double shots in one morning.
I'm bummed that you're still not getting the results you want - I'd echo what was said about looking coarse. Where are you grinding on the Niche?
(appreciate they aren't perfectly repeatable across calibrations).