When it is producing the micro bubbles is there any foam production in the cup? If so, is it light or dark colored? How long is the longest you've let it run, without fiddling with it?
All skimmers have a breakin period, some as long as a couple of weeks, I have no personal experience with this skimmer, but at this point I would turn the skimmer to allow the bubbles to rise to just the base of the neck and then leave it for a couple of days. At this point it is doubtful the bubbles will hurt anything and as the insides of the skimmer are coated with DOC
it will slow down some and probably stop producing the bubbles. At that point you can start to fine tune it.