I have been making masks for the last couple of months, and along the way and downsized for children and up-sized for beefy guys with beards. The one-size-fits-all approach is not effective for beards and/or big faces or noses.

Are you in the US or the UK? In the US I can mail you a couple to try out. (There doesn't seem to be much international mail with the lack of frequent flights, hence not even trying to mail to the UK).