Goldberg Variations - II

I’m trying to use the ‘Split secondary beam’ property but I can’t get it to work. In bar 4 there’s nothing I can select which will draw 16th beams between the first F# and the G. This also goes for bars 7, 21, 22 and 26. In bar 17 I can get 16th beams but not 32nd beams, which is how it’s notated. The Beam Together function in the contextual menu doesn’t seem to work, either.
Thanks for the info about the beam angle. I’m still a little baffled by the occasional grace note spacing.