Thanks guys.
Actually, you are going to think I am crazy. I don't use any vacuum chamber when casting. I pour fast as I can too. I make a ton of bubbles when I stir the pr. I made a stir stick from a paint can lid opener and attach it to a cordless drill. This makes short work of the mixing but makes a lot of tiny bubbles. These seem to dissipate within minutes. I think its the size of the bubbles???