Setting staff property to "small staff" will produce almost unreadable sixteenth notes.

Setting staff property to "small staff" produces sixteenth notes where the beam distances are to short, so it seems the there only one fat beam.

My opinion: Going to small staff should reduce the beam thickness too (proportionally).

See the attached score (setting staff properties of the flute line (staff #1) to small staff). You will see the effect in the sixteenth note beams.