I’ve own a niche for 3 years. For me, there’s no static issues, whether I use the cup or the PF with a dosing ring. I mean, yes, there are grinds which cling on to the funnel/cup, but a quick tap dissipates that. There’s no mess as such. I don’t see coffee grinds jumping out left right and centre as I used to see with the Kinu M68!
Maybe just need to season the burrs?