IGNORE anyone who goes on about "diffraction" at apertures past f11: they're parrotting ignorantly about someone else's opinions. Use f22 whenever you want: I do, it's ACE. Heck, I'd use f45 like I did with a MAN'S camera, if I could...!
USE THE LENS' WEAKNESSES AS STRENGTHS: go for the GLOW and go for f22: bonne chance!

Woof woof!