Ah, that's tough! I wish they had an in-between size! I would still probably go with the mini though, I think if the huit is already big for you, the neuf has even more width!
I am debating for a long time between sandalwood and taupe for the un nano and neuf mini and noticed you own both colors. I wonder which of the two colors do you find more versatile to match variaty of other colors in outfits as well all black outfits?