Video: something dark and FAST in my SPD condenser

During short path distillation today, I ramped up my temperature to quickly get through my tails and I saw something dark coming down through the condensors. I’ve attached a video.
The head temp was at about 190 when it started and the main body came through at 173. Stirring temp was 205. Before this started happening I started losing vacuum from about 450 microns to about 750.

My thoughts are that it’s either lack of preparation of the crude, or maybe that my top mantle is adding too much heat to the system.

Has anyone seen this before? What do you think it is?

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can you do it with so many microns?

The video makes it hard to see what you’re talking about. Can you take a photo of the receiving flask?

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