I have found that it is also important with the EV-180 to be sure that air can flow freely through out of the collection cup. I had where mine would skim very well until it filled up the collection cup, and then only produce a little.
I found that the drain hose from the collection cup had a dip in it and would fill with water. This would not shut down the skimmer, the air pressure could force the skimmate through the hose, but it WOULD reduce production.
Part of the problem with tuning the EV-180 is that it often LOOKS like it is working when it is not.
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