I finished the video ignoring this issue, but figured I should ask now encase it becomes an issue with the baking. I immediately noticed after the first floater, yours were hard to tell they were floating and mine have a hard black outline that I assume is a shadow.
I have matcap and Ambient occlusion, I have the floaters as close as possible but the distance from the object seems to not affect the weird outline.
Also I love the time lapsing in this video because you stop and go over sections and remind us what you are doing :3