I'm so sorry,
@ItalianateGirl I was asking
@MelisTreasures about her plant.
But I'm glad you asked about yours too. : ) IME with Scheffs, leaves drop if it gets too cold (left outside under 40°) or if the soil gets too dry. See if keeping on top of those things helps this winter. I would look at those aspects before trying to mess with the humidity.
I believe what you are referring to as a leaf cluster is a single compound leaf.
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https://www.uwgb.edu/biodivers...
From what you said, it sounds like your plant has 16 leaves. Are you able to add a pic?