This may be irrelevant to chemistry, then apologies in advance.
When removing bubbles from glue or silicone with vacuum, the answer to foam is to use wide flat containers. I used a bell jar fit on a glass plate with silicone grease. The vacuum hose fit a hole in the plate with epoxy glue. The glue to degas was in an additional flat container.
Defoamers, or defoaming agents, are very efficient. They are usually formulated for aqueous compounds. Some exist for polyethylene glycol hydraulic fluids. Silicone oils have some chemical inertness.
Add some moving part that mechanically punches the bubbles.
Dilute the mixture with a runny nonvolatile liquid.