I had a Cuisinart, and had the same problem. I decided I needed a back up, so brought a cheapo from Ocean State Job Lot, to have just in case. I decided to give it a whirl, just to try it out, and guess what.....no little bubbles! So now I use the cheapo, and my Cuisinart is my back up. The Job Lot blender cost $10. I used to try to burp the Cuisinart, stick it into the batter at an angle so air could escape, nothing seemed to work. Not saying that all Cuisinarts have that problem, and I don't know what makes the cheapo work any better. All I know is that it does. And not being as powerful as the Cuisinart, my soap seems to trace a bit slower, which is a good thing, too. Other than trying another SB, I don't know what to suggest. Drilling holes in the bell may work, but sometimes I think air is drawn down through the shaft. It's a frustrating problem, that's for sure.