Thanks for the posts on this, I'm experimenting myself with the Niche and Espro.
With espresso I'm in the 6-12 range (using a Decent and VST baskets, so pretty fine grind setting for the profiles I'm doing). For the Espro I undid one complete turn and left it on 10. 1oz to 18oz water, 4 minutes which includes 30 seconds of a 4oz first step / pre-wet to make sure everything is soaked. Water temp is likely around 201°F as I'm at an elevation where it will boil at 202ish.
Originally I was suspicious that would be way too fine, but I must say - I was wrong. Bright, sweet, full, thick, everything is there from my espresso blend. I guess it could be thicker but that's a good start.
Plunging was do-able but a little slow going.
This will make a good combo to bring to coffee shops when trying to sell coffee. A whole lot easier to drag around with me than the EK!
FWIW- I originally tried two complete un-screws of the grind setting dial, even at 6 minutes it felt weak but still a lot of character. The one time around setting is much better. This discussion saved me a lot of time and beans!