I'm not familiar with that skimmer but there should be a way to adjust the water level in the skimmer body. It sounds like you are getting too much water into the skimmer and not enough coming out. According to the website I just looked at there should be a valve on supply line going into the skimmer to adjust the water flow. Try and adjust the water level. You will probably want the water level just below the neck of the skimmer cup.