Blueprint not scaling with Foliage Painter

Hey guys,
I am trying to use a blueprint in the Foliage painter, and it works fine other than scaling. I have scaling set to uniform with Min 1 and Max 5, and the mesh remains the same consistent scale. My blueprint is currently just a group of static meshes, created by “Convert Selected Components to Blueprint Class.”

How can I get these to scale correctly? I have noticed that I CAN paint the Tutorial Character blueprint with varying scale, so it looks like varying BP scale is possible.