How long have you had yours running? Mine has been running for about 2 months, it finally broke in maybe a couple weeks ago. I have the cup o-ring about 1.25-1.5 from the bottom, pretty high. Air valve is about half way open at best, MB are very minimal for me at this point. But it wasn't until it broke in that the MB finally started going away. Water level in center chamber is about 1in. below top of baffle
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I got it up and running a little over a month. You have you water level that low? Maybe I lower mine. I'm about a half inch OVER the baffle. Lol