Your cup is too low. You might want to find a way to raise it by .5"-1". I had one a while back and it was skimming really wet too. I'd tried using pins, clips, etc and they always end up falling inside the skimmer. It was a pain.
I haven't try this yet, but you can try to restrict the air line so less air go into the pump. You need only enough air to get really fine bubbles. Too much air can produce big bubbles.
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Broke @55
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