I'm no expert but my skimmer is oversized for my tank too and the foam is inconsistent because of it. It doesn't bother me because eventually after its properly tuned it it will spill over and then the foam dies down a bit. Once the foam has enough organics in it it will build up again and spill over again. I just get spurts of spillage. Instead of emptying the cup daily I'm able to do it every 5-7 days.
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