There is no such thing as plume/bloom. There are sugars, salts, fungi, and molds.
You probably know the Friends of Habanos mold study. I have aged stuff that looks under a x10 loupe like what are on Lots 5, 6 & 8, which according to Australia Biotech Laboratories are "bacterial plant growth." I've never seen sugar or salt for that matter (but I probably couldn't tell even if I had). Have you seen sugar on non-vac aged sealed pipe tobacco? I gather you've seen salts.