I've had similar issues when I had my overflow go straight down. Not sure if it's a complete solution but having a bend or something along the lines of a 45 so that the water can "slide" into the sump seems to lend itself better to a steady-state operation. There could also be maybe not enough air coming into the overflow. Anyhow just some random thoughts I hope might be helpful, good luck.
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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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