Nice work. You said you mushed the foil in the mold. I'll assume by doing that some of the leaves are mushed as well. Something to think about while experimenting is to paint the tube and glue the leaves straight to the tube. This might be hard to explain but when I do shredded money I glue the paper pieces to the tube then take parchment paper and wrap it around the tube. Then as you keep rolling it it will get tighter and tighter. I use this as a clamping method as well. I'll tape the parchment paper around the tube and let set overnight or so. This will also help with bubbles and make sure you don't have any strips sticking out. When dry do a clear tube in cast. The blank will be easier to finish since the resin will be smooth on the surface.