Basically it's still burping then. You should be able to adjust it, one way or the other, into a steady state. I mean, I don't even see the levels in my overflow chambers varying by 1mm, they're that steady. (I don't have any overflows that go straight down though, all of them have a bend of some sort along the way).
In your case I'm wondering if there is some kind of air flow issue within the overflow pipe. How much air can get in there now? You may need to increase the air intake's ability (drill more holes, or enlarge the hole that's there).
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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