I'd check your return lines. Are they buried into the sump? I have that problem on my skimmer if the end of the return is not like "above" the water line it forces the water up higher.
The BUBBLES are a big part of the collection problem. You should have some sort of adjustment or air tube to change that flow.
This is the second one of these I've seen with a similar problem. (All of them have this same problem getting setup the first time, just a similar model)
Good news is that once you get it tweaked it's pretty self powered.
75gal Salt, 18gal Sump, Skimmer, 60lb Live Rock, 90lb Live Sand, 3 Pwrhd, 2x55w Actinic, 2x55w 10k. Guest list: Goby Green Clown, Percula Clown and entire clean up crew.