Thanks for bearing with my pedantry!
I'll talk to Sam and see what I can do about giving lighter roasts a shot. We've got a session coming up where we'll cup the TW coffee anyway, the Niche is pretty portable and Sam's ability to dial in a shot quickly and make it repeatably is quite impressive, so it might be pretty easy to do. Likely this time around we'll need to do it on my Decent machine instead of the Vesuvius. We can try to use a similar fairly standard brew pressure profile and I suppose it might be even better, in that we can graph the pressure or flow that each grinder produces against each other ... and then scratch our heads about whether the differences are significant and, if so, what they mean!