Yeah, I rarely flute it too, but was interesting to try it and felt reasonable. Just tried your grip on a 18490 config and I think it would be easier to do your grip on the mini. Usually I have the index just under the window and the thumb on the button when I used either of the two larger sizes and now that I examined how I was holding it, yeah, my pinky does kinda work its way down there.
EDIT: After trying your grip, my grip style is in major flux, doesn't know which way it wants to hold it.
I did indeed, with a 7th on custom order status. Already got plans for an 8th, but I need to find another mod to go with it. Thinking a Reos is next. I think I'm done for the 3ml size after that. If I get more anytime realatively soon, it will be the xl sized tanks to go with some boge xxl cartos.