That is a good thing. At times I feed heavy, so this will produce more waste.
I have mine set to a level where it is very thick and will sometimes adhere to the sides/neck of the collection cup.
That last video I posted had about 1/4 to 1/2 thick skim on the walls of the neck. Not normal for most skimmers/systems. While I do set it slightly higher, that is my normal flow/collection/cleanout in my skimmer.
Can you tune it down a bit to let the bubbles concentrate the skim some more. That will make it thicker. You may have to raise it slightly in the sump, if it is an insump skimmer.
You can use lego's or lighting egg crate to raise it.
Mine has an adjustment gate for outflow. So I keep it tuned. I only have to fine tune it once every two weeks or so.