I do this as well. My current kit is a WE Select Petit Verdot. I used a drill mounted stirring device to whip it when adding the KMeta, sorbate and chitosan. Got very few tiny bubbles when Vacuvin first applied. Added oak cubes 24 hours later, and have kept under Vacuvin for past 4 days, pumping a couple of times a day. As soon as oak cubes entered the picture I have consistently gotten a good ring of foam each time that I pump. The foam is subsided after a few hours, then reappears when I pump again and the cubes are still afloat. I'm thinking there is still a lot of CO2, even though I stirred it good and hard with the drill mounted rod. Any idea if I would hurt anything if I went ahead and stirred it again? Or should I just continue to keep under Vacuvin? It will be due for another racking in 4 days.