Hi perren,
Yep, that is about as good as it gets. There isn't much you can do to alter the water / bubble level except open the water intake grill wide open (at which point it stops surface skimming properly), open the air completely, and restrict the passage of water past the heater, but if you do that you run a real risk of either cavitating the circulation pumps or oveflowing the tank or the collection cups when you feed. The max skimmer is, in a word, poo. I have fiddled endlessly with it, but I think there is a fundamental design flaw between the water intake size and shape, the skimmer height, and the pump air intake calibration. The whole thing needs to sit about 15mm lower in its chamber, and the overflow needs to have an open top instead of a cable shroud. A lot of people install Deltec MC500s with good results.