After all that, then draw it too.
There is still some risidual moisture in the middle of the wood, the heat dries the outside by layers, the inside does not dry as quick. The suction draws it out of the ends.
Just a trick I learned on wood.
After drying, I put it in the chamber and draw a suction over night.
A dew meter shows how much moisture is being removed , but few shops have a dew meter to measure the moisture.
Ever notice that fresh cut hard wood has a wax sealer put on the end. This is to prevent moisture from being sucked up inside and getting trapped. You will need to make sure the wax has been removed before stabilizing.
BTW the bubbling is air being removed. It looks like it is boiling.