Skimmer driving me nuts >.<

[Myka]

Mine skim wet, I have the water line about 2/3 up the neck on all of them. That is considering the neck to be from where it joins to the skimmer body all the way up to where it overflows into the cup. They will overflow if I let the cup will up more than about halfway, I'm not sure why they suddenly overflow, but at least it is predictable.