Ya this oil is very very sensitive to heat changes. If to low it just sits there with expanded bubbles but no movement. If just right temp the bubbles slowly move, pop, then form again. But as soon as a tiny bit too much heat then bam right back to a warm puddle of melty oil with no bubbles or movement again.
Last night before I went to bed I set the griddle to be holding around 125f. The oil was around 85-90. Knowing that the oil will creep up in temp I thought that would be a roughly good temp to leave it over night with the vac on full, valves closed off and the vac machine off. I wasn't sure if the chamber would hold the full vac with the valves closed for that long. But thought I would try it cause I didn't want the machine going in the garage all night again. So it did. It held the full vac. I woke up this morning and the chamber was at full vac and the oil had a lot of expanded bubbles on it but it wasn't moving much. I took a picture that I'll post in a few minutes. I turned the heat up a bit to see if it will make it move more so the bubbles will start popping again.