I need a quick skimmer tutorial...problem

Sometimes my skimmers go nuts and pump tons of water into the collection cups. Since I have the cup drains closed, the water fills up the cup, uproots the lid, and overflows back into the sump, carrying with it a bunch of poop buildup.

So how do you guys deal with your collection cup drains? Do you ever get periods of heavy water collection instead of foam scum collection in the cups? Do you have a drainage hose going somewhere like a 5 gallon bucket? I thought about doing this but I am afraid the 5 gallon bucket may fill up and overflow and eventually drain my system down.

 

They are both octopus skimmers. One of them is fed by a single sicci pump, and the other is fed by two sicci pumps. There does not to seem to be any problem with my water supply or my air supply.
Most times these skimmers work flawlessly and every week I dump the gunk. But sometimes they go freaking nuts as described above.

 

The skimmers are in the sump. They have a constant water supply. They stand in even water, about 6-8" in the water as instructed. They are NOT fed by the overflow.

I'll check for air restriction and the like later on. I just cleaned these skimmers recently and was building a nice scum. Working perfectly and then BOOM major overflow.

I would like to re-state my main question in a more straightforward way before it gets lost....

Q: What is your strategy for your collection cup drain. Do you keep it closed? Do you drain it off somewhere? Where do you drain it?